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Marketable Equity Securities (Details 1) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Marketable Equity Securities |  |
Marketable equity securities at cost | $ 1,440 | $ 1,440
Cumulative unrealized loss on marketable equity securities | (389) | (491)
Marketable equity securities at fair value | $ 1,051 | $ 949

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