COMPOSITION OF CERTAIN FINANCIAL STATEMENT ITEMS (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Aggregate cost	$ 3,780	$ 2,373
Net unrealized gain (loss) on investments		(153)
Gross unrealized losses	549	196
Gross unrealized gains	0	43
Investment in common stock of company affiliated with company board members	938	285
Depreciation expenses	416	522
Retired assets	103	1,200
Depreciated assets	280	359
Amortization expense	$ 22	$ 20