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CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 30, 2017
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 3,140 $ 2,761
Debt discount, noncurrent $ 2,952 $ 3,792
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 20,000,000 20,000,000
Common stock, shares issued (in shares) 9,209,913 9,100,923
Common stock, shares outstanding (in shares) 9,209,913 9,100,923