Investment in Marketable Securities - Schedule of Trading Securities (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Jun. 30, 2020
Net unrealized loss	$ 768,000	$ (2,367,000)	$ 4,016,000	$ (2,565,000)
Corporate Equities [Member]
Cost	32,500,000		32,500,000		$ 11,459,000
Gross unrealized gain			7,857,000		902,000
Gross unrealized loss			(3,361,000)		(6,183,000)
Net unrealized loss			4,496,000		(5,281,000)
Fair value	$ 36,996,000		$ 36,996,000		$ 6,178,000