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Marketable Equity Securities (Details 2) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Marketable Equity Securities |  |
Cost of marketable equity securities sold | $ 264,000 | $ 395,000
Realized (loss) gain on marketable equity securities sold | (201,000) | (248,000)
Proceeds from the sale of marketable equity securities sold | 63,000 | 147,000
Net (loss) gain on marketable equity securities | (295,000) | (166,000)
Additions to marketable equity securities | 0 | 0
Change in marketable equity securities at fair value | $ (358,000) | $ (313,000)

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