4. Fair Value of Financial Instruments (Details 1) - USD ($)	Dec. 31, 2019	Jun. 30, 2019
Cost	$ 30,000	$ 339,400
Fair value	(15,300)	330,900
Unrealized holding gain (loss)	14,700	(8,500)
Equity Securities
Cost	79,500	47,100
Fair value	251,000	72,000
Unrealized holding gain (loss)	330,500	24,900
Mutual Funds
Cost	109,500	292,300
Fair value	235,700	258,900
Unrealized holding gain (loss)	$ 345,200	$ (33,400)