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Note 2 - Investments - Reconciliation of Investments Recorded at Fair Value (Details) (Parentheticals) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Income Statement [Abstract] |  |  |  |  |  |
Investment Income, Net | $ 354 |  | $ 1,416 |  | $ 1,271 | $ 903
Statement Of Other Comprehensive Income Abstract [Domain] |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | $ (134) | $ (142) | $ (171) | $ (214) | $ (276) | $ (385)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Investment Income, Net |  |  |  |  |
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] | Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |

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