Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED BALANCE SHEETS (Parentheticals)

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CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 140 $ 98
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) 28,336,955 28,288,764
Common stock, shares outstanding (in shares) 26,980,360 26,932,169
Treasury stock, common shares (in shares) 1,356,595 1,356,595