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) gain on marketable securities	$ (112,000)	$ 197,000
Unrealized loss on marketable securities related to Comstock	(124,000)	(1,138,000)
Unrealized (loss) gain on marketable securities	(154,000)	87,000
Net loss on marketable securities	$ (390,000)	$ (854,000)

The increase (decrease), resulting in a loss, in the difference between the fair value and the carrying value, or in the comparative fair values, of securities held at each balance sheet date, that was included in earnings for the period.

No definition available.

Name:	us-gaap_UnrealizedLossOnSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration