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Note 11 - Stock Repurchase Program (Details Textual) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 05, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Treasury Stock [Member] |  |  |  |
Shares Acquired Under Stock Repurchases Program, Shares |  | 3,303,500 |  |
Stock Repurchase Program, Authorized Amount | $ 200,000 |  |  |
Stock Repurchase Program, Period in Force | 2 years |  |  |
Payments for Repurchase of Common Stock |  | $ 99,942 |  |

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- Definition Number of shares that have been repurchased during the period and are being held in treasury + References No definition available. + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Details
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