Investment in Marketable Securities, Net - Schedule of Changes in Unrealized Gains and Losses on Investments (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	$ 95,000	$ (31,000)	$ 121,000	$ (97,000)
Corporate Equities [Member]
Cost	4,449,000		4,449,000		$ 5,788,000
Gross Unrealized Gain			141,000		108,000
Gross Unrealized Loss			(3,876,000)		(5,026,000)
Net Unrealized Loss			(3,735,000)		(4,918,000)
Fair Value	$ 714,000		$ 714,000		$ 870,000