Investment in Marketable Securities, Net - Schedule of Net Gains (Losses) on Marketable Securities (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Realized gain (loss) on marketable securities, net	$ (1,053,000)	$ 51,000	$ (1,029,000)	$ 47,000
Unrealized gain (loss) on marketable securities, net	1,148,000	(82,000)	1,150,000	(144,000)
Unrealized gain (loss) on marketable securities related to Comstock	(36,000)	(48,000)	34,000	(273,000)
Net gain (loss) on marketable securities	$ 59,000	$ (79,000)	$ 155,000	$ (370,000)