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Note 11 - Stockholders' Equity (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 87 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | May 20, 2022 | Dec. 31, 2021 | Jul. 01, 2015
Treasury Stock, Shares, Total (in shares) | 347,439 | 347,439 |  | 347,439 |  | 129,037 |
Stock Repurchase Program, Authorized Amount | $ 288,100 | $ 288,100 |  | $ 288,100 | $ 450,000 |  | $ 250,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  |  | 600,000
Treasury Stock, Shares, Acquired (in shares) |  | 232,637 |  | 443,268 |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 115,322 | $ 307,031 |  | $ 411,900 |  |  |
Payment, Tax Withholding, Share-Based Payment Arrangement |  | $ 4,826 | $ 8,035 |  |  |  |
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) |  | 2,790 | 3,650 |  |  |  |

X
- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585 + Details
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- Definition Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement. + References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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