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Unaudited Condensed Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Allowance for doubtful accounts $ 649 $ 631
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) 16,630,597 16,630,597
Common stock, shares outstanding (in shares) 16,630,597 16,630,597