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Marketable Investment Securities (Details Narrative) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract]        
Sales of marketable investment securities $ 0 $ 0 $ 0 $ 0
Realized gains or losses 0 0 0 0
Matured marketable investment securities 4,500,000 11,500,000 8,700,000 18,200,000
Other-than-temporary impairments $ 0 $ 0 $ 0 $ 0