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Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current Assets:
Allowance for Doubtful Receivables and Sales Returns	$ 3,241	$ 3,108
Equity:
Common Stock, par value (in dollars per share)	$ 0.375	$ 0.375
Common Stock, authorized (in shares)	60,000,000	60,000,000
Common Stock, issued (in shares)	17,881,177	17,688,350
Common Stock, outstanding (in shares)	17,881,177	17,688,350

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