Note 2 - Investments - Amortized Cost and Fair Value of Debt Securities By Contractual Maturity (Details) - USD ($)	Mar. 31, 2025	Dec. 31, 2024
One year or less, amortized cost	$ 312,246	$ 2,329,128
One year or less, fair value	312,247	2,329,128
After one year through five years, amortized cost	17,862,816	18,590,198
After one year through five years, fair value	17,764,445	18,410,081
After five years through ten years, amortized cost	3,141,352	2,032,061
After five years through ten years, fair value	3,069,474	1,967,540
More than 10 years, amortized cost	19,380,291	20,606,740
More than 10 years, fair value	16,088,940	17,025,901
Debt securities, amortized cost, total	82,556,371	83,785,307
Debt securities, fair value, total	78,878,689	79,578,179
Redeemable Preferred Stock [Member]
Debt securities, amortized cost	2,563,173	2,562,893
Debt securities, fair value	2,395,034	2,411,234
Debt securities, amortized cost, total	2,563,173	2,562,893
Debt securities, fair value, total	2,395,034	2,411,234
Collateralized Mortgage-Backed Securities [Member]
Debt securities, amortized cost	39,296,493	37,664,287
Debt securities, fair value	39,248,549	37,434,295
Debt securities, amortized cost, total	39,296,493	37,664,287
Debt securities, fair value, total	$ 39,248,549	$ 37,434,295