FAIR VALUE MEASUREMENTS (Details) - USD ($)	Mar. 31, 2017	Jun. 30, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment in marketable securities	$ 6,045,000	$ 6,358,000
Basic materials [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment in marketable securities	3,050,000	4,684,000
Energy [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment in marketable securities	1,209,000	733,000
Other [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment in marketable securities	$ 1,786,000	$ 941,000