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Note 11 - Stockholders' Equity (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended | 75 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2020 | Jul. 01, 2015
Stock Issued During Period, Shares, New Issues (in shares) | 287,500 |  |  |  |  |
Proceeds from Issuance of Common Stock, Net | $ 469,800 |  |  |  |  |
Treasury Stock, Shares, Ending Balance (in shares) |  | 130,467 |  | 130,467 | 147,695 |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  | $ 250,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  | 600,000
Treasury Stock, Shares, Acquired (in shares) |  | 0 |  | 210,631 |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  | $ 104,900 |  |
Payment, Tax Withholding, Share-based Payment Arrangement |  | $ 8,035 | $ 5,861 |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) |  | 3,650 | 3,810 |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |
Repayments of Debt | $ 100,000 |  |  |  |  |

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