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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts receivable, allowance for doubtful accounts | $ 2,141 | $ 2,042
Finished goods | 53,202 | 58,196
Work in process | 703 | 650
Raw materials | $ 9,465 | $ 8,455
Preferred stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Preferred stock, shares authorized (in shares) | 300,000 | 300,000
Preferred stock, shares issued (in shares) | 0 | 0
Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Common stock, shares authorized (in shares) | 50,000,000 | 50,000,000
Common stock, shares issued (in shares) | 15,255,694 | 15,202,387
Common stock, shares outstanding (in shares) | 15,255,694 | 15,202,387

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