Note 2 - Investments - Valuation Allowance on Securities (Details) - Real Estate Loan [Member] - USD ($)	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Change in provision for credit losses	$ 88,501	$ 432,975
Specific Allowance [Member]
Beginning allowance balance	0	0
Change in provision for credit losses	0	670,013
Charge-offs	0	(420,013)
Ending Allowance	0	250,000
General Allowance [Member]
Beginning allowance balance	99,118	55,685
Change in provision for credit losses	88,501	182,975
Charge-offs	0	0
Ending Allowance	$ 187,619	$ 238,660