Note 2 - Investments - Mortgage Loans by Loan-to-value Ratio (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Total commercial mortgages	$ 23,790,073	$ 3,653,142
Debt-to-Value Ratio, 70 to 80 Percent [Member]
Total commercial mortgages	8,219,763	0
Debt-to-Value Ratio, 60 to 70 Percent [Member]
Total commercial mortgages	5,196,975	1,960,547
Debt-to-Value Ratio, 50 to 60 Percent [Member]
Total commercial mortgages	4,682,750	0
Debt-to-Value Ratio, 40 to 50 Percent [Member]
Total commercial mortgages	3,235,951	339,335
Debt-to-Value Ratio, 30 to 40 Percent [Member]
Total commercial mortgages	0	195,310
Debt-to-Value Ratio, 20 to 30 Percent [Member]
Total commercial mortgages	1,319,975	0
Debt-to-Value Ratio, 10 to 20 Percent [Member]
Total commercial mortgages	$ 1,134,659	$ 1,157,950