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Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 28, 2015
Dec. 28, 2014
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts receivable, current $ 49 $ 110
Accumulated amortization on other assets $ 1,155 $ 1,067
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 50,000,000 50,000,000
Common stock, shares issued 24,548,824 24,445,345
Common stock, shares outstanding 22,187,664 22,180,458
Treasury stock, shares 2,361,160 2,264,887