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Note 8 - Capital Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended | 125 Months Ended | 156 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 20, 2026 | Feb. 26, 2026 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2025 | Dec. 31, 2025 | Feb. 20, 2026 | Oct. 12, 2022 | Dec. 09, 2021 | Feb. 08, 2018 | Jul. 29, 2015
Stock Repurchased and Retired During Period, Value |  |  | $ 7,260 | $ 3,290 | $ 9,424 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  | $ 1.44 | $ 1.44 | $ 1.8 | $ 2.475 | $ 3.9 | $ 3.95 | $ 4.8 | $ 5.35 | $ 8.4 | $ 8.4 | $ 9.6 | $ 10.8 | $ 6.975 |  | $ 69.57 |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.12 | $ 0.12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000
Stock Repurchase Program, Additional Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,300,000 | 3,372,399 | 904,564 |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,183,601 | 3,539,861 | 1,061,315 | 156,751
Stock Repurchased and Retired During Period, Shares (in shares) |  |  | 1,113,224 | 396,241 |  |  |  |  |  |  |  |  |  |  |  | 6,257,826 |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  | $ 7,300 | $ 3,300 |  |  |  |  |  |  |  |  |  |  |  | $ 84,800 |  |  |  |  |  |
Shares Acquired, Average Cost Per Share (in dollars per share) |  |  | $ 6.52 | $ 8.3 |  |  |  |  |  |  |  |  |  |  |  | $ 13.55 |  |  |  |  |  |
Share Repurchase Program [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,719,137 |  |  |  |

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