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Note 6 - Dividends (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Common Stock, Dividends, Per Share, Declared $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.18 $ 0.18
Payments of Ordinary Dividends, Common Stock     $ 14,700       $ 14,651 $ 14,630