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COMPOSITION OF CERTAIN FINANCIAL STATEMENT ITEMS (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Aggregate cost $ 6,483 $ 3,780
Net unrealized gain (loss) on investments 1,563  
Gross unrealized losses 1,703 549
Gross unrealized gains 140 0
Investment in common stock of company affiliated with company board members 847 938
Depreciation expenses 559 416
Retired assets 58 103
Depreciated assets 39 280
Amortization expense $ 14 $ 22