Quarterly report pursuant to Section 13 or 15(d)

Investments in Debt Securities (Narrative) (Details)

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Investments in Debt Securities (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Investments in Debt and Equity Securities [Abstract]        
Amortization of premiums on debt securities $ 0 $ 7,000 $ 0 $ 67,000