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Note 13 - Subsequent Events (Details Textual) - $ / shares |  |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 13, 2023 | Oct. 12, 2023 | Jul. 13, 2023 | Apr. 13, 2023 | Jan. 12, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  | $ 0.34 | $ 0.33 | $ 0.33 |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) |  |  |  |  |  | $ 0.34 | $ 0.32 | $ 1 | $ 0.94
Forecast [Member] |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) | $ 0.34 |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Dividends Payable, Date Declared |  | Oct. 12, 2023 |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  | $ 0.34 |  |  |  |  |  |  |
Dividends Payable, Date to be Paid |  | Dec. 13, 2023 |  |  |  |  |  |  |
Dividends Payable, Date of Record |  | Dec. 01, 2023 |  |  |  |  |  |  |

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