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Investments (Summary of Held-to-Maturity Debt Securities by Contractual Maturity) (Details) - USD ($)
Sep. 30, 2023
Jun. 30, 2023
Amortized cost basis    
Due within one year $ 17,183,653 $ 17,064,274
Amortized cost basis 17,183,653 17,064,274
Fair Value    
Due within one year 17,118,434 16,970,534
Fair Value $ 17,118,434 $ 16,970,534