Investment in Marketable Securities - Schedule of Trading Securities (Details) - USD ($)	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Gross unrealized loss	$ (1,272,000)	$ (927,000)
Net unrealized loss	(1,913,000)	(1,733,000)
Corporate Equities [Member]
Cost	11,459,000	19,204,000
Gross unrealized gain	902,000	1,753,000
Gross unrealized loss	(6,183,000)	(11,261,000)
Net unrealized loss	(5,281,000)	(9,508,000)
Fair value	$ 6,178,000	$ 9,696,000