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Note 16 - Subsequent Events (Details Textual) - USD ($) |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 24, 2023 | Aug. 25, 2023 | May 25, 2023 | Feb. 24, 2023 | May 25, 2022 | Feb. 25, 2022 | Nov. 30, 2023 | Oct. 31, 2023 | Aug. 31, 2023 | Jul. 31, 2023 | May 31, 2023 | Apr. 30, 2023 | Feb. 28, 2023 | Jan. 31, 2023 | May 31, 2022 | Apr. 30, 2022 | Feb. 28, 2022 | Jan. 31, 2022 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Jul. 31, 2022
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.075 | $ 0.075 |
Dividends Payable |  |  |  |  |  |  |  |  | $ 54,000 |  | $ 53,000 |  | $ 53,000 |  | $ 53,000 |  | $ 53,000 |  | $ 7,000 |  |  |  |  |  | $ 7,000 |  | $ 53,000
Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends | $ 3,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable |  |  |  |  |  |  | $ 54,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Dividend [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.025 |  | $ 0.025 |  | $ 0.025 |  | $ 0.025 |  | $ 0.025 |  |  |  |  |  |  | $ 0.025 |  |
Dividends |  | $ 3,200,000 | $ 2,800,000 | $ 2,800,000 | $ 2,600,000 | $ 2,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,700,000 |  |
Quarterly Dividend [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  |  |  |  |  |  | $ 0.025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Equivalent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |  | $ 333,000 |  | 282,000 |  | 283,000 |  | 214,000 |  | 214,000 |  |  |  |  |  |  |  | $ 263,000,000,000 |  |
Dividends Payable |  |  |  |  |  |  |  |  |  |  | $ 5,000 |  | $ 5,000 |  | $ 2,000 |  | $ 2,000 |  |  |  |  |  |  |  |  |  |
Dividend Equivalent [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  | 335,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable |  |  |  |  |  |  | $ 2,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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