Note 2 - Investments - Mortgage Loans by Loan-to-value Ratio (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Total commercial mortgages	$ 21,644	$ 21,644
Commercial mortgage loans	18,627,526	19,638,897
Allowance for credit losses	(21,644)	(21,644)
Total commercial mortgages	18,605,882	19,617,253
Debt-to-Value Ratio, 70 to 80 Percent [Member]
Total commercial mortgages	0	7,123,604
Allowance for credit losses	0	(7,123,604)
Debt-to-Value Ratio, 60 to 70 Percent [Member]
Total commercial mortgages	3,167,230	3,137,953
Allowance for credit losses	(3,167,230)	(3,137,953)
Debt-to-Value Ratio, 50 to 60 Percent [Member]
Total commercial mortgages	8,611,437	2,322,273
Allowance for credit losses	(8,611,437)	(2,322,273)
Debt-to-Value Ratio, 40 to 50 Percent [Member]
Total commercial mortgages	2,325,780	2,327,436
Allowance for credit losses	(2,325,780)	(2,327,436)
Debt-to-Value Ratio, 30 to 40 Percent [Member]
Total commercial mortgages	0	377,621
Allowance for credit losses	0	(377,621)
Debt-to-Value Ratio, 20 to 30 Percent [Member]
Total commercial mortgages	2,873,993	2,689,619
Allowance for credit losses	(2,873,993)	(2,689,619)
Debt-to-Value Ratio, 10 to 20 Percent [Member]
Total commercial mortgages	1,649,086	1,660,391
Allowance for credit losses	$ (1,649,086)	$ (1,660,391)