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Stock Options, Stock Grants and New Stock (Summary of Stock Option Activity) (Details) (USD $)
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12 Months Ended |
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Jan. 03, 2015
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Dec. 28, 2013
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Dec. 29, 2012
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Jan. 01, 2011
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Dec. 31, 2011
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |
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| Outstanding, beginning of year, weighted average exercise price (dollars per share) |
$ 11.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
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$ 11.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
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$ 11.28us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
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| Exercises, weighted average exercise price (dollars per share) |
$ 11.23us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
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$ 10.69us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
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$ 10.50us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
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| Canceled / Expired, weighted average exercise price (dollars per share) |
$ 13.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
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$ 12.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
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$ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
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| Outstanding, end of year, weighted average exercise price (dollars per share) |
$ 12.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
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$ 11.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
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$ 11.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
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| Exercisable, weighted average exercise price (dollars per share) |
$ 11.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |
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| Outstanding, beginning of year (shares) |
162,736us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
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220,740us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
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120,800us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
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| Exercised (shares) |
(17,074)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
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(15,247)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
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(11,800)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
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| Canceled / Expired (shares) |
(2,157)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
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(83,351)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
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0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
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| Outstanding, end of year (shares) |
157,295us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
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162,736us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
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220,740us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
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| Exercisable (shares) |
56,787us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Roll Forward] |
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| Expected to vest, beginning of the year, weighted average exercise price (dollars per share) |
$ 12.18us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
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$ 11.97us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
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| Vested, weighted average exercise price (dollars per share) |
$ 11.98synl_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsVestedDuringPeriodWeightedAverageExercisePrice
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$ 11.49synl_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsVestedDuringPeriodWeightedAverageExercisePrice
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| Forfeited unvested options (dollars per share) |
$ 13.70us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
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$ 12.71us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
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| Expected to vest, end of the year, weighted average exercise price (dollars per share) |
$ 12.54us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
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$ 12.18us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
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$ 11.97us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
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| Expected to vest (shares) |
122,145us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
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191,740us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
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| Vested (shares) |
(33,702)synl_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVested
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(27,347)synl_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVested
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| Forfeited unvested options (shares) |
(1,725)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
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(82,842)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
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| Expected to vest (shares) |
100,508us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
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122,145us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
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191,740us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
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| Options outstanding, weighted average contractual term (years) |
6 years 11 months
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7 years 6 months
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8 years 5 months
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8 years
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| Options exercisable, weighted average contractual term (years) |
6 years 5 months
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| Options expected to vest, weighted average contractual term (years) |
7 years 2 months
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7 years 9 months
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8 years 11 months
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| Options outstanding, intrinsic value |
$ 852,810us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
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$ 582,894us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
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$ 367,937us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
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$ 6,448us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Authorized |
169,384us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
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181,017us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
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138,260us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
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250,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
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| Options exercisable, intrinsic value |
$ 337,467us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
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| Options granted, weighted average fair value (dollars per share) |
$ 6.76us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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$ 7.19us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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$ 6.40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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| February 9, 2012 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |
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| Granted, weighted average exercise price (dollars per share) |
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$ 11.35us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardDateAxis
= synl_February92012Member
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |
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| Granted (shares) |
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(36,740)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardDateAxis
= synl_February92012Member
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Roll Forward] |
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| Granted, weighted average exercise price (dollars per share) |
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$ 11.35us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardDateAxis
= synl_February92012Member
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| Granted (shares) |
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(36,740)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardDateAxis
= synl_February92012Member
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| August 21, 2012 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |
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| Granted, weighted average exercise price (dollars per share) |
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$ 12.73us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardDateAxis
= synl_August212012Member
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |
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| Granted (shares) |
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(75,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardDateAxis
= synl_August212012Member
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Roll Forward] |
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| Granted, weighted average exercise price (dollars per share) |
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$ 12.73us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardDateAxis
= synl_August212012Member
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| Granted (shares) |
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(75,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardDateAxis
= synl_August212012Member
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| February 7, 2013 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |
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| Granted, weighted average exercise price (dollars per share) |
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$ 13.70us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardDateAxis
= synl_February72013Member
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |
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| Granted (shares) |
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(40,594)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardDateAxis
= synl_February72013Member
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Roll Forward] |
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| Granted, weighted average exercise price (dollars per share) |
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$ 13.70us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardDateAxis
= synl_February72013Member
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| Granted (shares) |
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(40,594)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardDateAxis
= synl_February72013Member
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| Options granted, weighted average fair value (dollars per share) |
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$ 6.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardDateAxis
= synl_February72013Member
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| February 20, 2014 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |
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| Granted, weighted average exercise price (dollars per share) |
$ 14.76us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardDateAxis
= synl_February202014Member
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |
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| Granted (shares) |
(13,790)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardDateAxis
= synl_February202014Member
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Roll Forward] |
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| Granted, weighted average exercise price (dollars per share) |
$ 14.76us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardDateAxis
= synl_February202014Member
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| Granted (shares) |
(13,790)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardDateAxis
= synl_February202014Member
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| Options granted, weighted average fair value (dollars per share) |
$ 6.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardDateAxis
= synl_February202014Member
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