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Investments - Marketable Securities (Details) - USD ($)	3 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Investments
Amortized Cost, Current	$ 747,000	$ 852,000
Amortized Cost, Due from one through five years	3,046,000	2,692,000
Amortized Cost, Due from six through ten years	1,839,000	2,837,000
Amortized Cost, Total	5,632,000	6,381,000
Market Value, Current	746,000	848,000
Market Value, Due from one through five years	3,053,000	2,677,000
Market Value, Due from six through ten years	1,797,000	2,749,000
Market Value, Total	5,596,000	$ 6,274,000
Sale of held-to-maturity debt security	$ 400,000

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