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Net Income per Share - General (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 02, 2016
Jul. 04, 2015
Jul. 02, 2016
Jul. 04, 2015
Net income available to common shareholders        
Net income, as reported $ 5,215 $ 3,325 $ 7,637 $ 6,104
Common stock equivalents:        
Less: net income attributable to participating shares 37 24 54 46
Net income available to common shareholders $ 5,178 $ 3,301 $ 7,583 $ 6,058
Reconciliation of basic to diluted weighted average shares of common stock outstanding        
Basic weighted average shares outstanding 8,695,000 9,034,000 8,783,000 9,112,000
Common stock equivalents:        
Stock options, restricted shares, and restricted stock units (in shares) 84,000 219,000 42,000 216,000
Diluted weighted average shares outstanding 8,779,000 9,253,000 8,825,000 9,328,000
Calculation of common stock equivalents for purposes of computing diluted weighted average shares outstanding        
Anti-dilutive securities excluded from EPS computation (in shares) 532,734 371,421 958,857 381,577