Note 2 - Investments - Amortized Cost and Fair Value of Debt Securities By Contractual Maturity (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
One year or less, amortized cost	$ 102,457	$ 442,846
One year or less, fair value	97,506	450,461
After one year through five years, amortized cost	17,269,255	17,048,721
After one year through five years, fair value	17,191,862	17,035,270
After five years through ten years, amortized cost	6,312,529	5,498,364
After five years through ten years, fair value	5,897,906	5,340,498
More than 10 years, amortized cost	21,577,332	21,337,372
More than 10 years, fair value	16,980,297	17,638,063
Available for sale securities, amortized cost	73,920,845	70,615,724
Debt securities, fair value, total	67,216,814	65,316,077
Redeemable Preferred Stock [Member]
Debt securities, amortized cost	3,620,327	3,875,526
Debt securities, fair value	3,183,290	3,355,615
Available for sale securities, amortized cost	3,625,096	3,875,526
Debt securities, fair value, total	3,187,991	3,355,615
Collateralized Mortgage-Backed Securities [Member]
Debt securities, amortized cost	25,038,945	22,412,895
Debt securities, fair value	23,865,953	21,496,170
Available for sale securities, amortized cost	25,038,945	22,412,895
Debt securities, fair value, total	$ 23,865,953	$ 21,496,170

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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