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Note 6 - Dividends (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Common Stock, Dividends, Per Share, Declared (in dollars per share) $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.18 $ 0.18
Payments of Ordinary Dividends, Common Stock             $ 14,671 $ 14,651