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INVESTMENTS (Details) - Debt Securities, Available-for-sale and Held-to-Maturity - Corporate Debt Securities [Member] - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021
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Available-for-sale Securities [Member] |  |  |
INVESTMENTS (Details) - Debt Securities, Available-for-sale and Held-to-Maturity [Line Items] |  |  |
Amortized Cost | [1] | $ 8,770 | $ 8,741
Gross Unrealized Gains in Other Comprehensive Income | [1] | 7,520 | 8,308
Gross Unrealized Losses in Earnings | [1] | (438) | 0
Fair Value | [1] | 15,852 | 17,049
Held-to-maturity Securities [Member] |  |  |
INVESTMENTS (Details) - Debt Securities, Available-for-sale and Held-to-Maturity [Line Items] |  |  |
Amortized Cost | [2] | 1,000 | 1,000
Gross Unrecognized Holding Gains | [2] | 2 | 3
Gross Unrecognized Holding Losses | [2] | 0 | 0
Fair Value | [2] | $ 1,002 | $ 1,003
[1] | Changes in unrealized gains and losses are included in the statement of comprehensive income (loss), except for embedded derivatives. Changes in unrealized and realized gains and losses for embedded derivatives are included in earnings in the statement of operations.
[2] | Held-to-maturity debt investments are carried at amortized cost.

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