Note 2 - Investments - Mortgage Loans by Loan-to-value Ratio (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Total commercial mortgages	$ 34,611	$ (0)
Commercial mortgage loans	21,757,193	23,790,073
Allowance for credit losses	(34,611)	0
Total commercial mortgages	21,722,582	23,790,073
Debt-to-Value Ratio, 70 to 80 Percent [Member]
Total commercial mortgages	7,995,198	8,219,763
Allowance for credit losses	(7,995,198)	(8,219,763)
Debt-to-Value Ratio, 60 to 70 Percent [Member]
Total commercial mortgages	3,136,506	5,196,975
Allowance for credit losses	(3,136,506)	(5,196,975)
Debt-to-Value Ratio, 50 to 60 Percent [Member]
Total commercial mortgages	4,669,053	4,682,750
Allowance for credit losses	(4,669,053)	(4,682,750)
Debt-to-Value Ratio, 40 to 50 Percent [Member]
Total commercial mortgages	2,151,326	3,235,951
Allowance for credit losses	(2,151,326)	(3,235,951)
Debt-to-Value Ratio, 30 to 40 Percent [Member]
Total commercial mortgages	902,657	0
Allowance for credit losses	(902,657)	0
Debt-to-Value Ratio, 20 to 30 Percent [Member]
Total commercial mortgages	1,800,000	1,319,975
Allowance for credit losses	(1,800,000)	(1,319,975)
Debt-to-Value Ratio, 10 to 20 Percent [Member]
Total commercial mortgages	1,102,453	1,134,659
Allowance for credit losses	$ (1,102,453)	$ (1,134,659)