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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 | |||||||||||||
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Feb. 09, 2012
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Dec. 29, 2012
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Dec. 31, 2011
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Jan. 01, 2011
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Dec. 29, 2012
Stock Options [Member]
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Dec. 31, 2011
Stock Options [Member]
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Jan. 01, 2011
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. 29, 2012
1998 Plan [Member]
Stock Options [Member]
stock_option_plan
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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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Jan. 01, 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. 29, 2012
Non Employee Director [Member]
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Dec. 31, 2011
Non Employee Director [Member]
individual
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Jan. 01, 2011
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 | ||||||||||||||||
| Annual vesting rate (percent) | 20.00% | 20.00% | 20.00% | ||||||||||||||||
| Options granted (shares) | 36,740 | 100,000 | 36,740 | 100,000 | 75,000 | 75,000 | |||||||||||||
| Options granted, weighted average exercise price (dollars per share) | $ 11.35 | $ 11.55 | $ 11.35 | $ 11.55 | $ 12.73 | $ 12.73 | |||||||||||||
| Options granted, weighted average fair value (dollars per share) | $ 5.03 | $ 6.40 | $ 7.93 | $ 0.00 | $ 5.03 | $ 7.93 | $ 5.44 | $ 5.44 | |||||||||||
| Risk free interest rate (percent) | 2.04% | 3.34% | 1.80% | ||||||||||||||||
| Expected volatility rate (percent) | 53.00% | 0.49% | 51.00% | ||||||||||||||||
| Expected life (years) | 7 years | 7 years | 7 years | ||||||||||||||||
| Expected dividend yield (percent) | 2.10% | 2.10% | 2.10% | ||||||||||||||||
| Number of stock option plans (plans) | 2 | ||||||||||||||||||
| Expiration period (years) | 10 years | ||||||||||||||||||
| Stock options exercised (in shares) | 11,800 | 19,200 | 9,900 | 11,800 | 19,200 | 9,900 | |||||||||||||
| Option exercises, aggregate exercise price | $ 124,000 | $ 176,000 | $ 49,000 | ||||||||||||||||
| Cash received from exercise of stock options | 123,888 | 161,903 | 39,000 | ||||||||||||||||
| Stock repurchased during year (shares) | 1,045 | 1,016 | |||||||||||||||||
| Stock repurchased during year | 14,000 | 10,000 | |||||||||||||||||
| Options exercisable (shares) | 29,000 | 29,000 | 20,800 | 44,000 | |||||||||||||||
| Options exercisable, weighted average exercise price (dollars per share) | $ 10.84 | $ 10.84 | $ 9.96 | $ 9.13 | |||||||||||||||
| Share-based compensation expense | 337,750 | 276,553 | 179,814 | 228,000 | 111,000 | 7,000 | 110,000 | 165,000 | 174,000 | ||||||||||
| Total unrecognized compensation cost | 1,046,000 | 262,000 | |||||||||||||||||
| Share-based compensation, weighted average period of recognition (years) | 3 years 9 months 15 days | 2 years 10 months 10 days | |||||||||||||||||
| Granted (shares) | 0 | 13,420 | 51,500 | ||||||||||||||||
| Share-based compensation expense, stock grants | 332,000 | 406,000 | |||||||||||||||||
| Share-based compensation expense, period of recognition (years) | 60 months | ||||||||||||||||||
| Share-based compensation expense, net of taxes | 70,000 | 105,000 | 110,000 | ||||||||||||||||
| Share-based compensation expense, net of taxes, (dollars per share) | $ 0.01 | $ 0.02 | $ 0.02 | ||||||||||||||||
| Treasury stock issued to each nonemployee director (shares) | 1,598 | ||||||||||||||||||
| Issuance of shares of common stock from the treasury (in shares) | 19,089 | 18,280 | 13,949 | 7,990 | 7,238 | 1,531 | |||||||||||||
| Annual cash retainer fees | $ 20,000 | $ 15,000 | $ 15,000 | ||||||||||||||||
| Number of directors retiring during period (individual) | 2 | ||||||||||||||||||
| Forfeitures of treasury stock issued to each nonemployee director (shares) | 1,248 | ||||||||||||||||||