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Investments (Summary of Held-to-Maturity Debt Securities by Contractual Maturity) (Details) - USD ($) | Dec. 31, 2023 | Jun. 30, 2023
--- | --- | ---
Amortized cost basis |  |
Due within one year | $ 12,071,737 | $ 17,064,274
Due after one year through five years | 5,000,920 |
Amortized cost basis | 17,072,657 | 17,064,274
Fair Value |  |
Due within one year | 12,052,010 | 16,970,534
Due after one year through five years | 5,007,890 |
Fair Value | $ 17,059,900 | $ 16,970,534

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