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Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Oct. 01, 2016
Jul. 02, 2016
Apr. 02, 2016
Jan. 02, 2016
Oct. 03, 2015
Jul. 04, 2015
Apr. 04, 2015
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Net income available to common shareholders                      
Net income, as reported $ 2,058 $ 3,193 $ 5,215 $ 2,423 $ (1,307) $ 2,860 $ 3,325 $ 2,779 $ 12,888 $ 7,657 $ 13,638
Less: net income attributable to participating shares                 95 59 20
Net income available to common shareholders                 $ 12,793 $ 7,598 $ 13,618
Reconciliation of basic to diluted weighted average shares of common stock outstanding                      
Basic weighted average shares outstanding 8,269,000 8,177,000 8,695,000 8,871,000 8,876,000 8,940,000 9,034,000 9,190,000 8,503,000 9,010,000 9,747,000
Stock options, restricted stock shares and restricted stock units                 98,000 185,000 150,000
Diluted weighted average shares outstanding 8,443,000 8,309,000 8,779,000 8,927,000 8,876,000 9,025,000 9,253,000 9,403,000 8,601,000 9,195,000 9,897,000
Basic (in dollars per share) $ 0.25 $ 0.39 $ 0.60 $ 0.27 $ (0.15) $ 0.32 $ 0.37 $ 0.30 $ 1.50 $ 0.84 $ 1.40
Diluted (in dollars per share) $ 0.24 $ 0.38 $ 0.59 $ 0.27 $ (0.15) $ 0.31 $ 0.36 $ 0.30 $ 1.49 $ 0.83 $ 1.38
Calculation of common stock equivalents for purposes of computing diluted weighted average shares outstanding                      
Anti-dilutive securities excluded from EPS computation (in shares)                 581,546 522,593 764,748