Note 2 - Investments - Mortgage Loans by Loan-to-value Ratio (Details) - USD ($)	Jun. 30, 2026	Dec. 31, 2025
Commercial mortgage loans	$ 32,580,376	$ 23,744,155
Allowance for credit losses	(163,114)	(99,118)
Carrying value	32,417,262	23,645,037
Debt-to-Value Ratio, Over 80 Percent [Member]
Commercial mortgage loans	0	265,283
Debt-to-Value Ratio, 70 to 80 Percent [Member]
Commercial mortgage loans	2,614,617	892,800
Debt-to-Value Ratio, 60 to 70 Percent [Member]
Commercial mortgage loans	16,114,066	8,868,648
Debt-to-Value Ratio, 50 to 60 Percent [Member]
Commercial mortgage loans	5,391,567	5,700,000
Debt-to-Value Ratio, 40 to 50 Percent [Member]
Commercial mortgage loans	4,226,960	4,312,074
Debt-to-Value Ratio, 30 to 40 Percent [Member]
Commercial mortgage loans	3,657,299	1,705,350
Debt-to-Value Ratio, 20 to 30 Percent [Member]
Commercial mortgage loans	75,867	1,500,000
Debt-to-Value Ratio, 10 to 20 Percent [Member]
Commercial mortgage loans	$ 500,000	$ 500,000

Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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