Note 2 - Investments - Summary of Mortgage Loans by Aging Category (Details) - USD ($)	Mar. 31, 2025	Dec. 31, 2024
Mixed use	$ 24,683,227	$ 25,248,434
Allowance for credit losses	(488,660)	(55,685)
Mortgage Loans on Real Estate	24,194,567	$ 25,192,749
Financial Asset, Not Past Due [Member]
Mixed use	22,446,895
Allowance for credit losses	(258,684)
Mortgage Loans on Real Estate	22,188,211
Financial Asset, 1 to 30 Days Past Due [Member]
Mixed use	0
Allowance for credit losses	0
Mortgage Loans on Real Estate	0
Financial Asset, 31 to 60 Days Past Due [Member]
Mixed use	0
Allowance for credit losses	0
Mortgage Loans on Real Estate	0
Financial Asset, 61 to 90 Days Past Due [Member]
Mixed use	0
Allowance for credit losses	0
Mortgage Loans on Real Estate	0
Financial Asset, Greater than 90 Days Past Due [Member]
Mixed use	2,236,332
Allowance for credit losses	(229,976)
Mortgage Loans on Real Estate	$ 2,006,356