FAIR VALUE MEASUREMENTS - Non-recurring basis (Details) - USD ($)	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net loss	$ (98,000)	$ (242,000)
Other Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other non-marketable investments	612,000	813,000
Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other non-marketable investments	$ 612,000	$ 813,000