Note 2 - Investments - Gross Unrealized Losses (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Available-for-sale securities, less than 12 months, fair value	$ 21,146,649	$ 36,541,093
Available-for-sale securities, less than 12 months, unrealized loss	(1,071,031)	(3,444,132)
Available-for-sale securities, fair value	47,825,050	44,708,495
Debt Securities, Gross Unrealized Loss	(7,210,148)	(5,704,466)
Available-for-sale securities, greater than 12 months, fair value	26,678,401	8,167,402
Available-for-sale securities, greater than 12 months, unrealized loss	(6,139,117)	(2,260,334)
US Treasury Securities [Member]
Available-for-sale securities, less than 12 months, fair value	690,755	398,375
Available-for-sale securities, less than 12 months, unrealized loss	(98,068)	(5,031)
Available-for-sale securities, fair value	690,755	398,375
Debt Securities, Gross Unrealized Loss	(98,068)	(5,031)
Corporate Debt Securities [Member]
Available-for-sale securities, less than 12 months, fair value	690,775	12,378,486
Available-for-sale securities, less than 12 months, unrealized loss	(32,855)	(1,883,706)
Available-for-sale securities, fair value	15,092,312	15,585,399
Debt Securities, Gross Unrealized Loss	(3,906,741)	(3,150,382)
Available-for-sale securities, greater than 12 months, fair value	14,401,537	3,206,913
Available-for-sale securities, greater than 12 months, unrealized loss	(3,873,886)	(1,266,676)
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities, less than 12 months, fair value	744,392	4,711,896
Available-for-sale securities, less than 12 months, unrealized loss	(48,764)	(587,053)
Available-for-sale securities, fair value	5,270,748	5,420,410
Debt Securities, Gross Unrealized Loss	(942,149)	(808,227)
Available-for-sale securities, greater than 12 months, fair value	4,526,356	708,514
Available-for-sale securities, greater than 12 months, unrealized loss	(893,385)	(221,174)
Redeemable Preferred Stock [Member]
Available-for-sale securities, less than 12 months, fair value	59,531	2,384,771
Available-for-sale securities, less than 12 months, unrealized loss	(2,380)	(363,193)
Available-for-sale securities, fair value	3,066,430	3,355,615
Debt Securities, Gross Unrealized Loss	(438,045)	(519,911)
Available-for-sale securities, greater than 12 months, fair value	3,006,899	970,844
Available-for-sale securities, greater than 12 months, unrealized loss	(435,665)	(156,718)
Term Loans [Member]
Available-for-sale securities, less than 12 months, fair value	8,191,836	6,309,005
Available-for-sale securities, less than 12 months, unrealized loss	(298,775)	(146,395)
Available-for-sale securities, fair value	8,191,836	6,309,005
Debt Securities, Gross Unrealized Loss	(298,775)	(146,395)
Collateralized Mortgage-Backed Securities [Member]
Available-for-sale securities, less than 12 months, fair value	10,769,360	10,358,560
Available-for-sale securities, less than 12 months, unrealized loss	(590,189)	(458,754)
Available-for-sale securities, fair value	15,512,969	13,639,692
Debt Securities, Gross Unrealized Loss	(1,526,370)	(1,074,520)
Available-for-sale securities, greater than 12 months, fair value	4,743,609	3,281,132
Available-for-sale securities, greater than 12 months, unrealized loss	$ (936,181)	$ (615,766)