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Note 13 - Shareholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 15, 2010 | Dec. 31, 2016 | Jul. 26, 2016 | Dec. 31, 2015 | Oct. 14, 2010
Stock Issued During Period, Shares, Acquisitions | 3,360,000 |  |  |  |
Stock Issued During Period at Purchase Price Per Share, Acquisition | $ 15 |  |  |  |
Stock Issued During Period, Value, Acquisitions | $ 50.4 |  |  |  |
Percentage of Shares Sold of Common Stock Issued and Outstanding | 87.60% |  |  |  |
Common Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01 |  | $ 0.01 | $ 2
Common Stock, Shares Authorized | 100,000,000 | 100,000,000 |  | 100,000,000 |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  | 500,000 |  |
Treasury Stock, Shares, Acquired |  | 72,471 |  |  |
Treasury Stock Acquired, Average Cost Per Share |  | $ 14.04 |  |  |

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