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MARKETABLE SECURITIES (Details) - Common Stock [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Net Investment Income [Line Items] |  |
Cost | $ 10,271,000 | $ 53,475,000
Gross unrealized gains | 383,000 | 32,000
Gross unrealized losses | (4,064,000) | (13,127,000)
Fair value | $ 6,590,000 | $ 40,380,000

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