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Note 10 - Share Repurchase Program (Details) | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2007
Disclosure Text Block Supplement [Abstract] |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  | 1,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Treasury Stock, Shares, Acquired | 0 us-gaap_TreasuryStockSharesAcquired | 0 us-gaap_TreasuryStockSharesAcquired | 0 us-gaap_TreasuryStockSharesAcquired |

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- Details
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Data Type: | xbrli:stringItemType
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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