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INVESTMENTS (Details) - Components of Company's Equity Securities Measured at Fair Value - USD ($) $ in Thousands | Dec. 31, 2019 | Jun. 30, 2019
--- | --- | ---
Securities at fair value |  |
Securities, Cost | $ 13,128 | $ 14,640
Securities, Unrealized Gains (Losses) | (3,106) | 547
Securities, Fair Value | 10,022 | 15,187
Common Stock - International [Member] |  |
Securities at fair value |  |
Securities, Cost | 5,641 | 5,641
Securities, Unrealized Gains (Losses) | (2,892) | 790
Securities, Fair Value | 2,749 | 6,431
Common Stock - Domestic [Member] |  |
Securities at fair value |  |
Securities, Cost | 45 | 45
Securities, Unrealized Gains (Losses) | (45) | (45)
Securities, Fair Value | 0 | 0
Fixed Income Securities [Member] |  |
Securities at fair value |  |
Securities, Cost | 6,513 | 8,025
Securities, Unrealized Gains (Losses) | 0 | (4)
Securities, Fair Value | 6,513 | 8,021
Mutual Funds, Domestic Equity [Member] |  |
Securities at fair value |  |
Securities, Cost | 929 | 929
Securities, Unrealized Gains (Losses) | (169) | (194)
Securities, Fair Value | $ 760 | $ 735

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