Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current Assets:
Allowance For Doubtful Receivables And Sales Returns	$ 2,655	$ 3,241
Equity:
Common Stock, par value per share	$ 0.375	$ 0.375
Common Stock, shares authorized	60,000,000	60,000,000
Common Stock, shares issued	18,073,713	17,881,177
Common Stock, shares outstanding	18,073,713	17,881,177