Investment in Marketable Securities - Schedule of Trading Securities (Details) - Corporate Equities [Member] - USD ($)	6 Months Ended	12 Months Ended
	Dec. 31, 2019	Jun. 30, 2019
Cost	$ 10,576,000	$ 19,204,000
Gross unrealized gain	1,672,000	1,753,000
Gross unrealized loss	(4,100,000)	(11,261,000)
Net unrealized loss	(2,428,000)	(9,508,000)
Fair value	$ 8,148,000	$ 9,696,000