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Note 4 - Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Jun. 30, 2023
Amortized Cost, available for sale $ 6,204 [1] $ 7,729
Amortized Cost, held to maturity debt securities, due after five years through ten years 1,000  
Investments in debt securities [1] 4,414  
Fair Value, held to maturity debt securities, due after five years through ten years $ 868  
[1] Principal payments of $750,000 are due quarterly with a final maturity in January 2026.