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Consolidated Balance Sheets (Current Period Unaudited) Parenthetical - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Trade receivables, allowances $ 1,257 $ 945
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 50,000,000 50,000,000
Preferred stock, shares issued 0 0
Preferred Stock, shares outstanding 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 300,000,000 300,000,000
Common stock, shares issued 44,076,000 43,748,000
Treasury stock, at cost 5,167,000 5,167,000