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Marketable Equity Securities (Details 2) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Marketable Equity Securities        
Cost of marketable equity securities sold $ 0 $ 0 $ 0 $ 0
Realized (loss) gain on marketable equity securities sold 54,000 0 54,000 0
Proceeds from the sale of marketable equity securities sold (54,000) 0 (54,000) 0
Net (loss) gain on marketable equity securities 302,000 (227,000) 310,000 (102,000)
Change in marketable equity securities at fair value $ 248,000 $ (227,000) $ 256,000 $ (102,000)