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Fair Value of Financial Instruments (Details) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
ASSETS      
Cash and cash equivalents   $ 1,927,100 $ 2,971,100
Investment securities $ 4,928,700 4,272,100 6,391,600
Total 4,928,700 6,199,200 9,362,700
Level 1      
ASSETS      
Cash and cash equivalents   1,927,100 2,971,100
Investment securities 4,928,700 4,035,500 5,276,600
Total 4,928,700 5,962,600 8,247,700
Level 2      
ASSETS      
Cash and cash equivalents   0 0
Investment securities 0 236,600 1,115,000
Total 0 236,600 1,115,000
Level 3      
ASSETS      
Cash and cash equivalents   0 0
Investment securities 0 0 0
Total $ 0 $ 0 $ 0