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Consolidated Balance Sheets (Current Period Unaudited) Parenthetical - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Trade receivables, allowances $ 980 $ 591
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 44,564,000 44,353,000
Treasury stock, at cost 5,367,000 5,367,000