Note 2 - Investments - Mortgage Loans by Loan-to-value Ratio (Details) - USD ($)	Mar. 31, 2023	Jan. 01, 2023	Dec. 31, 2022
Total commercial mortgages	$ 137,148	$ 137,148	$ (0)
Commercial mortgage loans	25,422,131	25,422,131	23,790,073
Allowance for credit losses	(137,148)	(137,148)	0
Total commercial mortgages	$ 25,284,983	25,284,983	23,790,073
Debt-to-Value Ratio, 70 to 80 Percent [Member]
Total commercial mortgages		8,230,409	8,219,763
Allowance for credit losses		(8,230,409)	(8,219,763)
Debt-to-Value Ratio, 60 to 70 Percent [Member]
Total commercial mortgages		5,196,975	5,196,975
Allowance for credit losses		(5,196,975)	(5,196,975)
Debt-to-Value Ratio, 50 to 60 Percent [Member]
Total commercial mortgages		5,002,438	4,682,750
Allowance for credit losses		(5,002,438)	(4,682,750)
Debt-to-Value Ratio, 40 to 50 Percent [Member]
Total commercial mortgages		3,234,448	3,235,951
Allowance for credit losses		(3,234,448)	(3,235,951)
Debt-to-Value Ratio, 30 to 40 Percent [Member]
Total commercial mortgages		2,639,974	1,319,975
Allowance for credit losses		(2,639,974)	(1,319,975)
Debt-to-Value Ratio, 20 to 30 Percent [Member]
Total commercial mortgages		1,117,887	1,134,659
Allowance for credit losses		$ (1,117,887)	$ (1,134,659)