Note 2 - Investments - Mortgage Loans by Loan-to-value Ratio (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Total commercial mortgages	$ 34,611	$ (0)
Commercial mortgage loans	24,329,346	23,790,073
Allowance for credit losses	(34,611)	0
Total commercial mortgages	24,294,735	23,790,073
Debt-to-Value Ratio, 70 to 80 Percent [Member]
Total commercial mortgages	8,214,050	8,219,763
Allowance for credit losses	(8,214,050)	(8,219,763)
Debt-to-Value Ratio, 60 to 70 Percent [Member]
Total commercial mortgages	4,276,547	5,196,975
Allowance for credit losses	(4,276,547)	(5,196,975)
Debt-to-Value Ratio, 50 to 60 Percent [Member]
Total commercial mortgages	5,330,127	4,682,750
Allowance for credit losses	(5,330,127)	(4,682,750)
Debt-to-Value Ratio, 40 to 50 Percent [Member]
Total commercial mortgages	4,055,181	3,235,951
Allowance for credit losses	(4,055,181)	(3,235,951)
Debt-to-Value Ratio, 30 to 40 Percent [Member]
Total commercial mortgages	1,300,000	1,319,975
Allowance for credit losses	(1,300,000)	(1,319,975)
Debt-to-Value Ratio, 20 to 30 Percent [Member]
Total commercial mortgages	1,153,441	1,134,659
Allowance for credit losses	$ (1,153,441)	$ (1,134,659)