FAIR VALUE MEASUREMENTS (Details) - USD ($)	Jun. 30, 2017	Jun. 30, 2016
Assets:
Investment in marketable securities	$ 17,177,000	$ 14,282,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Investment in marketable securities	17,177,000	14,282,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Bond Securities [Member]
Assets:
Investment in marketable securities	1,683,000
Basic Materials [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Investment in marketable securities	6,222,000	9,273,000
Energy [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Investment in marketable securities	1,345,000	1,907,000
Technology [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Investment in marketable securities	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	1,820,000
Financial Services [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Investment in marketable securities		1,021,000
Other [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Investment in marketable securities	$ 1,973,000	$ 2,081,000