FAIR VALUE MEASUREMENTS (Details) - USD ($)	Mar. 31, 2018	Jun. 30, 2017
Assets:
Investment in marketable securities	$ 9,442,000	$ 17,177,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Bond Securities [Member]
Assets:
Investment in marketable securities	2,208,000	1,683,000
Basic Materials [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Investment in marketable securities	1,328,000	6,222,000
Energy [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Investment in marketable securities	0	1,345,000
Technology [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Investment in marketable securities	1,241,000	4,134,000
REITs and Real Estate Companies [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Investment in marketable securities	2,504,000	1,820,000
Other [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Investment in marketable securities	$ 2,161,000	$ 1,973,000