Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current Assets:
Allowance For Doubtful Receivables and Sales Returns	$ 3,936	$ 4,526
Shareholders' Equity:
Preferred Stock, par value (in dollars per share)	$ 0.02	$ 0.02
Preferred Stock, authorized (in shares)	1,000,000us-gaap_PreferredStockSharesAuthorized	1,000,000us-gaap_PreferredStockSharesAuthorized
Preferred Stock, issued (in shares)	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Preferred Stock, outstanding (in shares)	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding
Common Stock, par value (in dollars per share)	$ 0.375	$ 0.375
Common Stock, authorized (in shares)	60,000,000us-gaap_CommonStockSharesAuthorized	60,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, issued (in shares)	18,415,047us-gaap_CommonStockSharesIssued	18,491,524us-gaap_CommonStockSharesIssued
Common Stock, outstanding (in shares)	18,415,047us-gaap_CommonStockSharesOutstanding	18,491,524us-gaap_CommonStockSharesOutstanding

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