FAIR VALUE MEASUREMENTS (Details) - USD ($)	Sep. 30, 2018	Jun. 30, 2018
Assets:
Investment in marketable securities	$ 14,005,000	$ 13,841,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Investment in marketable securities	14,005,000	13,841,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | REITs and real estate companies [Member]
Assets:
Investment in marketable securities	4,651,000	4,300,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member]
Assets:
Investment in marketable securities	2,576,000	2,282,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Technology [Member]
Assets:
Investment in marketable securities	1,960,000	1,813,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Healthcare [Member]
Assets:
Investment in marketable securities	1,697,000	1,777,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Energy [Member]
Assets:
Investment in marketable securities	829,000	311,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Basic material [Member]
Assets:
Investment in marketable securities	772,000	1,038,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Communications [Member]
Assets:
Investment in marketable securities	267,000	1,071,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Other [Member]
Assets:
Investment in marketable securities	$ 1,253,000	$ 1,249,000