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Note 15 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Feb. 28, 2018
Common Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01 |
ATM Program [Member] |  |  |
Stock Issued During Period, Shares, New Issues | 0 |  |
Share Repurchase Program [Member] |  |  |
Common Stock, Par or Stated Value Per Share |  |  | $ 0.01
Stock Repurchase Program, Authorized Amount |  |  | $ 300.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 224.9 |  |

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