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Stock Compensation Plans (Details 4) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 26, 2015
Dec. 27, 2014
Dec. 28, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares 72,375 187,625 344,375 639,950
Options Exercisable, Number of Shares 41,125 133,250 158,875  
Range Of Exercise Prices 5.28-5.66 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares 12,750      
Options Outstanding, Weighted-Average Remaining Contractual Life 3 months 18 days      
Options Outstanding, Weighted-Average Exercise Price $ 5.40      
Options Exercisable, Number of Shares 12,750      
Options Exercisable, Weighted-Average Exercise Price $ 5.40      
Range Of Exercise Prices 5.85-6.06 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares 24,625      
Options Outstanding, Weighted-Average Remaining Contractual Life 1 year 2 months 12 days      
Options Outstanding, Weighted-Average Exercise Price $ 5.85      
Options Exercisable, Number of Shares 13,375      
Options Exercisable, Weighted-Average Exercise Price $ 5.85      
Range Of Exercise Prices 11.86 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares 15,000      
Options Outstanding, Weighted-Average Remaining Contractual Life 2 years 2 months 12 days      
Options Outstanding, Weighted-Average Exercise Price $ 11.86      
Options Exercisable, Number of Shares 15,000      
Options Exercisable, Weighted-Average Exercise Price $ 11.86      
Range Of Exercise Prices 14.39 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares 20,000      
Options Outstanding, Weighted-Average Remaining Contractual Life 5 years 2 months 12 days      
Options Outstanding, Weighted-Average Exercise Price $ 14.39      
Options Exercisable, Number of Shares 0      
Options Exercisable, Weighted-Average Exercise Price $ 14.39