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Note 14 - Contingencies and Commitments (Details Textual) - USD ($) | 3 Months Ended
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Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022
Dividends, Common Stock, Cash |  | $ 312,000 | $ 320,000 | $ 322,000 | $ 329,000 | $ 335,000 | $ 335,000
Monthly Dividend [Member] | Forecast [Member] |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.0075 |  |  |  |  |  |
Dividends, Common Stock, Cash | $ 317,000 |  |  |  |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1 + Details
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