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CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Thousands	Apr. 01, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 2,868	$ 2,733
Debt discount, current	4	201
Debt discount, noncurrent	$ 2,789	$ 2,544
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)	9,070,317	9,031,263
Common stock, shares outstanding (in shares)	9,070,317	9,031,263

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For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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Amount of debt discount to be amortized within one year or within the normal operating cycle, if longer.

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