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CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)
$ in Thousands
Sep. 26, 2020
Dec. 28, 2019
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 4,158 $ 3,236
Debt discount, current 74 74
Debt discount, noncurrent $ 9,930 $ 12,481
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 outstanding (in shares) 9,461,540 9,365,768