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Stock Options, Stock Grants and New Stock (Narrative) (Details) (USD $)
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0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended | ||||||||||||||||||
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Sep. 30, 2013
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Feb. 07, 2013
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Feb. 09, 2012
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Dec. 28, 2013
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Dec. 29, 2012
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Dec. 31, 2011
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Dec. 28, 2013
Stock Options [Member]
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Dec. 29, 2012
Stock Options [Member]
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Dec. 31, 2011
Stock Options [Member]
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Feb. 07, 2013
2011 Plan [Member]
Stock Options [Member]
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Feb. 09, 2012
2011 Plan [Member]
Stock Options [Member]
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Jan. 24, 2011
2011 Plan [Member]
Stock Options [Member]
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Jan. 21, 2011
2011 Plan [Member]
Stock Options [Member]
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Dec. 28, 2013
2011 Plan [Member]
Stock Options [Member]
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Dec. 28, 2013
1998 Plan [Member]
Stock Options [Member]
stock_option_plan
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Dec. 28, 2013
2005 Stock Awards Plan [Member]
Stock Awards [Member]
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Dec. 29, 2012
2005 Stock Awards Plan [Member]
Stock Awards [Member]
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Dec. 31, 2011
2005 Stock Awards Plan [Member]
Stock Awards [Member]
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Aug. 21, 2012
President of Palmer [Member]
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Aug. 21, 2012
President of Palmer [Member]
2011 Plan [Member]
Stock Options [Member]
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Dec. 28, 2013
Non Employee Director [Member]
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Dec. 29, 2012
Non Employee Director [Member]
individual
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Dec. 31, 2011
Non Employee Director [Member]
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Sep. 30, 2013
Public Offering [Member]
Common Stock [Member]
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Dec. 28, 2013
Public Offering [Member]
Common Stock [Member]
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Sep. 30, 2013
Over-Allotment Option [Member]
Common Stock [Member]
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Apr. 25, 2013
Restricted Stock [Member]
Non Employee Director [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||||||||||||||
| Authorization of stock options (shares) | 350,000 | 350,000 | |||||||||||||||||||||||||
| Period after option grant before options can be exercised (years) | 1 year | 1 year | 1 year | 1 year | |||||||||||||||||||||||
| Annual vesting rate (percent) | 20.00% | 20.00% | 20.00% | 20.00% | |||||||||||||||||||||||
| Options granted (shares) | 40,594 | 36,740 | 100,000 | 40,594 | 36,740 | 100,000 | 75,000 | 75,000 | |||||||||||||||||||
| Options granted, weighted average exercise price (dollars per share) | $ 13.70 | $ 11.35 | $ 11.55 | $ 13.70 | $ 11.35 | $ 11.55 | $ 12.73 | $ 12.73 | |||||||||||||||||||
| Options granted, weighted average fair value (dollars per share) | $ 6.30 | $ 5.03 | $ 7.19 | $ 6.40 | $ 7.93 | $ 6.30 | $ 5.03 | $ 7.93 | $ 5.44 | $ 5.44 | |||||||||||||||||
| Risk free interest rate (percent) | 2.00% | 2.04% | 3.34% | 1.80% | |||||||||||||||||||||||
| Expected volatility rate (percent) | 53.00% | 53.00% | 49.00% | 51.00% | |||||||||||||||||||||||
| Expected life (years) | 7 years | 7 years | 7 years | 7 years | |||||||||||||||||||||||
| Expected dividend yield (percent) | 1.80% | 2.10% | 2.10% | 2.10% | |||||||||||||||||||||||
| Number of stock option plans (plans) | 2 | ||||||||||||||||||||||||||
| Expiration period (years) | 10 years | ||||||||||||||||||||||||||
| Stock options exercised (in shares) | 15,247 | 11,800 | 19,200 | 15,247 | 11,800 | 19,200 | |||||||||||||||||||||
| Option exercises, aggregate exercise price | $ 163,000 | $ 124,000 | $ 176,000 | ||||||||||||||||||||||||
| Cash received from exercise of stock options | 138,026 | 123,888 | 162,000 | ||||||||||||||||||||||||
| Stock Repurchased During Period, Shares | 1,752 | 1,045 | |||||||||||||||||||||||||
| Stock repurchased during year | 25,000 | 14,000 | |||||||||||||||||||||||||
| Options exercisable (shares) | 40,591 | 40,591 | 29,000 | 20,800 | |||||||||||||||||||||||
| Options exercisable, weighted average exercise price (dollars per share) | $ 11.26 | $ 11.26 | $ 10.84 | $ 9.96 | |||||||||||||||||||||||
| Share-based compensation expense | 331,362 | 337,750 | 276,553 | 249,000 | 228,000 | 111,000 | 82,000 | 110,000 | 165,000 | ||||||||||||||||||
| Total unrecognized compensation cost | 668,000 | 143,000 | |||||||||||||||||||||||||
| Share-based compensation, weighted average period of recognition (years) | 2 years 8 months 5 days | 1 year 11 months 15 days | |||||||||||||||||||||||||
| Granted (shares) | 0 | 13,420 | |||||||||||||||||||||||||
| Share-based compensation expense, period of recognition (years) | 60 months | ||||||||||||||||||||||||||
| Share-based compensation expense, net of taxes | 52,000 | 70,000 | 105,000 | ||||||||||||||||||||||||
| Share-based compensation expense, net of taxes, (dollars per share) | $ 0.01 | $ 0.01 | $ 0.02 | ||||||||||||||||||||||||
| Treasury stock issued to each nonemployee director (shares) | 1,598 | ||||||||||||||||||||||||||
| Issuance of shares of common stock from the treasury (in shares) | 17,572 | 19,089 | 18,280 | 9,411 | 7,990 | 7,238 | |||||||||||||||||||||
| Annual cash retainer fees | 128,000 | 20,000 | 15,000 | ||||||||||||||||||||||||
| Number of directors retiring during period (individual) | 2 | ||||||||||||||||||||||||||
| Forfeitures of treasury stock issued to each nonemployee director (shares) | 1,248 | ||||||||||||||||||||||||||
| Maximum annual retainer percent | 100.00% | ||||||||||||||||||||||||||
| Issuance of common stock (shares) | 2,300,000 | 2,000,000 | 300,000 | ||||||||||||||||||||||||
| Price of stock (usd per share) | $ 15.75 | $ 15.75 | |||||||||||||||||||||||||
| Proceeds from Issuance of Common Stock | 34,200,000 | ||||||||||||||||||||||||||
| Planned Payments to Acquire Machinery and Equipment | 3,500,000 | ||||||||||||||||||||||||||
| Repayments of Lines of Credit | $ 18,061,000 | ||||||||||||||||||||||||||