FAIR VALUE MEASUREMENTS (Details) - USD ($)	Jun. 30, 2018	Jun. 30, 2017
Assets:
Investment in marketable securities	$ 13,841,000	$ 17,177,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Investment in marketable securities	13,841,000	17,177,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | REITs and real estate companies [Member]
Assets:
Investment in marketable securities	4,300,000	1,820,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member]
Assets:
Investment in marketable securities	2,282,000	1,683,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Technology [Member]
Assets:
Investment in marketable securities	1,813,000	4,134,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Healthcare [Member]
Assets:
Investment in marketable securities	1,777,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Communications [Member]
Assets:
Investment in marketable securities	1,071,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Other [Member]
Assets:
Investment in marketable securities	$ 2,598,000	1,973,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Basic materials [Member]
Assets:
Investment in marketable securities		6,222,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Energy [Member]
Assets:
Investment in marketable securities		$ 1,345,000