Annual report pursuant to Section 13 and 15(d)

Long-term Debt (Line of Credit) (Details)

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Long-term Debt (Line of Credit) (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Jan. 03, 2015
Dec. 28, 2013
Nov. 21, 2014
Aug. 21, 2012
Jun. 30, 2010
Line of Credit Facility [Line Items]            
Variable rate basis LIBOR          
Revolving Line of Credit [Member]            
Line of Credit Facility [Line Items]            
Line of credit, maximum borrowing capacity $ 40,000,000     $ 40,000,000 $ 25,000,000 $ 20,000,000
Line of credit, increase to limit       $ 15,000,000 $ 5,000,000  
Stated interest rate (percent) 2.00% 1.77% 2.16%      
Unused capacity fee on line of credit (percent) 0.125%          
Line of credit, amount borrowed $ 1,876,000          
Line of credit, remaining availability 38,124,000          
Line of credit, average outstanding amount $ 6,446,000 $ 2,735,000 $ 19,860,000      
Line of credit, weighted average interest rate (percent) 2.48% 1.35% 1.74%      
Interest payments $ 1,149,000 $ 930,000 $ 1,202,000