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Consolidated Balance Sheets (Parentheticals) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Common Stock, Number of Shares, Par Value and Other Disclosures    
Common stock, par value      
Common stock, shares authorized 75,000,000us-gaap_CommonStockSharesAuthorized 75,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 38,591,000us-gaap_CommonStockSharesIssued 39,149,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 38,591,000us-gaap_CommonStockSharesOutstanding 39,149,000us-gaap_CommonStockSharesOutstanding
Preferred Stock, Number of Shares, Par Value and Other Disclosures    
Preferred stock, par value      
Preferred stock, shares authorized 10,000,000us-gaap_PreferredStockSharesAuthorized 10,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding