Investment in Marketable Securities - Schedule of Trading Securities (Details) - USD ($)	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Net unrealized loss	$ 8,248,000	$ (1,913,000)
Corporate Equities [Member]
Cost	29,816,000	11,459,000
Gross unrealized gain	8,834,000	902,000
Gross unrealized loss	(2,658,000)	(6,186,000)
Net unrealized loss	(5,976,000)	(5,281,000)
Fair value	$ 35,792,000	$ 6,178,000