Note 2 - Investments - Amortized Cost and Fair Value of Debt Securities By Contractual Maturity (Details) - USD ($)	Mar. 31, 2026	Dec. 31, 2025
One year or less, amortized cost	$ 374,235	$ 1,074,089
One year or less, fair value	372,441	1,072,360
After one year through five years, amortized cost	25,664,377	23,367,252
After one year through five years, fair value	25,513,104	23,263,307
After five years through ten years, amortized cost	4,233,458	4,878,273
After five years through ten years, fair value	4,033,331	4,797,585
More than 10 years, amortized cost	19,486,719	19,722,631
More than 10 years, fair value	16,214,595	16,711,796
Debt securities, amortized cost, total	92,469,798	90,036,854
Debt securities, fair value, total	88,263,413	86,534,704
Redeemable Preferred Stock [Member]
Debt securities, amortized cost	1,669,244	2,142,141
Debt securities, fair value	1,491,801	1,998,438
Debt securities, amortized cost, total	1,669,244	2,142,141
Debt securities, fair value, total	1,491,801	1,998,438
Collateralized Mortgage-Backed Securities [Member]
Debt securities, amortized cost	41,041,765	38,852,468
Debt securities, fair value	40,638,141	38,691,218
Debt securities, amortized cost, total	41,041,765	38,852,468
Debt securities, fair value, total	$ 40,638,140	$ 38,691,218