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Net Income per Share (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Net income available to common shareholders        
Net income, as reported $ 3,813 $ 5,215 $ 6,666 $ 7,637
Less: net income attributable to participating shares 24 37 44 54
Net income available to common shareholders $ 3,789 $ 5,178 $ 6,622 $ 7,583
Reconciliation of basic to diluted weighted average shares of common stock outstanding        
Basic weighted average shares outstanding 8,428,000 8,695,000 8,423,000 8,783,000
Stock options 190,000 84,000 196,000 42,000
Diluted weighted average shares outstanding 8,618,000 8,779,000 8,619,000 8,825,000
Calculation of common stock equivalents for purposes of computing diluted weighted average shares outstanding        
Anti-dilutive securities excluded from EPS computation (in shares) 192,504 532,734 56,360 958,857