Fair Value of Financial Instruments (Details 1) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2022
Fair value	$ 4,929,300	$ 4,272,100	$ 6,391,600
Cost	4,929,300	4,417,400	6,532,400
Unrealized holding gain (loss)	(600)	(145,300)	(140,800)
Equity Securities
Fair value		154,600	151,000
Cost		118,900	118,800
Unrealized holding gain (loss)		35,700	32,200
Mutual Funds
Fair value	4,928,700	3,880,900	5,125,600
Cost	4,928,700	4,063,100	5,299,500
Unrealized holding gain (loss)	$ (600)	(182,200)	(173,900)
Debt Securities
Fair value		236,600	1,115,000
Cost		235,400	1,114,100
Unrealized holding gain (loss)		$ 1,200	$ (900)