Note 2 - Investments - Mortgage Loans by Loan-to-value Ratio (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Total commercial mortgages	$ 21,644	$ (0)
Commercial mortgage loans	19,638,897	23,790,073
Allowance for credit losses	(21,644)	0
Total commercial mortgages	19,617,253	23,790,073
Debt-to-Value Ratio, 70 to 80 Percent [Member]
Total commercial mortgages	7,123,604	8,219,763
Allowance for credit losses	(7,123,604)	(8,219,763)
Debt-to-Value Ratio, 60 to 70 Percent [Member]
Total commercial mortgages	3,137,953	5,196,975
Allowance for credit losses	(3,137,953)	(5,196,975)
Debt-to-Value Ratio, 50 to 60 Percent [Member]
Total commercial mortgages	2,322,273	4,682,750
Allowance for credit losses	(2,322,273)	(4,682,750)
Debt-to-Value Ratio, 40 to 50 Percent [Member]
Total commercial mortgages	2,327,436	3,235,951
Allowance for credit losses	(2,327,436)	(3,235,951)
Debt-to-Value Ratio, 30 to 40 Percent [Member]
Total commercial mortgages	377,621	0
Allowance for credit losses	(377,621)	0
Debt-to-Value Ratio, 20 to 30 Percent [Member]
Total commercial mortgages	2,689,619	1,319,975
Allowance for credit losses	(2,689,619)	(1,319,975)
Debt-to-Value Ratio, 10 to 20 Percent [Member]
Total commercial mortgages	1,660,391	1,134,659
Allowance for credit losses	$ (1,660,391)	$ (1,134,659)