INVESTMENT IN MARKETABLE SECURITIES - Net loss on marketable securities (Details) - USD ($)	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
INVESTMENT IN MARKETABLE SECURITIES
Realized loss on marketable securities related to Comstock	$ 0	$ (6,007,000)
Realized (loss) gain on marketable securities	(806,000)	632,000
Unrealized loss on marketable securities related to Comstock	(254,000)	(2,337,000)
Net unrealized loss (gain) on marketable securities	(673,000)	5,935,000
Net loss on marketable securities	$ (1,733,000)	$ (1,777,000)