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CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 103 $ 53
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 24,294,084 24,221,558
Common stock, shares outstanding (in shares) 22,937,489 22,864,963
Treasury stock, common shares (in shares) 1,356,595 1,356,595