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Note 9 - Stockholders' Equity and Stock Incentive Plans (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 12, 2018
Share-based Payment Arrangement, Expense | $ 8,158 |  | $ 6,022 |  | $ 17,867 | $ 14,949 |
Performance Shares [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  | 395,964 |  | 486,805 |  |  |
Shares Issued Per Unit |  | 1.67 |  | 1.57 |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  | 125,004 |  | 149,268 |  |  |
Share Based Payment Arrangement, Shares Issued In Period, Net of Tax Withholdings |  | 270,960 |  | 337,537 |  |  |
Share-based Payment Arrangement, Expense |  | $ 0 |  | $ 0 |  |  |
The 2018 Plan [Member] |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 100,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 72,800 |  |  |  | $ 72,800 |  |

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