Investment in Marketable Securities - Schedule of Trading Securities (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020
Net unrealized loss	$ 3,501,000	$ (53,000)	$ 3,248,000	$ (198,000)
Corporate Equities [Member]
Cost	23,018,000		23,018,000		$ 11,459,000
Gross unrealized gain			4,001,000		902,000
Gross unrealized loss			(5,011,000)		(6,183,000)
Net unrealized loss			(1,010,000)		(5,281,000)
Fair value	$ 22,008,000		$ 22,008,000		$ 6,178,000