COMPOSITION OF CERTAIN FINANCIAL STATEMENT ITEMS (Marketable Equity Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Marketable equity securities - short-term	$ 2,884	$ 2,560
Marketable equity securities - long-term	3,238	2,360
Total marketable equity securities	$ 6,122	$ 4,920

Amount of investment in marketable security.

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Amount of investment in marketable security, classified as current.

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-Publisher FASB
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Amount of investment in marketable security, classified as noncurrent.

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