Note 2 - Investments - Gross Unrealized Losses (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Available-for-sale securities, less than 12 months, fair value	$ 32,006,465	$ 36,541,093
Available-for-sale securities, less than 12 months, unrealized loss	(1,757,593)	(3,444,132)
Available-for-sale securities, fair value	47,542,538	44,708,495
Debt Securities, Gross Unrealized Loss	(4,936,793)	(5,704,466)
Available-for-sale securities, greater than 12 months, fair value	15,536,073	8,167,402
Available-for-sale securities, greater than 12 months, unrealized loss	(3,179,200)	(2,260,334)
US Treasury Securities [Member]
Available-for-sale securities, less than 12 months, fair value	538,754	398,375
Available-for-sale securities, less than 12 months, unrealized loss	(41,739)	(5,031)
Available-for-sale securities, fair value	538,754	398,375
Debt Securities, Gross Unrealized Loss	(41,739)	(5,031)
Corporate Debt Securities [Member]
Available-for-sale securities, less than 12 months, fair value	8,676,598	12,378,486
Available-for-sale securities, less than 12 months, unrealized loss	(810,883)	(1,883,706)
Available-for-sale securities, fair value	15,978,602	15,585,399
Debt Securities, Gross Unrealized Loss	(2,643,662)	(3,150,382)
Available-for-sale securities, greater than 12 months, fair value	7,302,004	3,206,913
Available-for-sale securities, greater than 12 months, unrealized loss	(1,832,779)	(1,266,676)
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities, less than 12 months, fair value	4,380,766	4,711,896
Available-for-sale securities, less than 12 months, unrealized loss	(314,727)	(587,053)
Available-for-sale securities, fair value	5,380,523	5,420,410
Debt Securities, Gross Unrealized Loss	(582,559)	(808,227)
Available-for-sale securities, greater than 12 months, fair value	999,757	708,514
Available-for-sale securities, greater than 12 months, unrealized loss	(267,832)	(221,174)
Redeemable Preferred Stock [Member]
Available-for-sale securities, less than 12 months, fair value	278,213	2,384,771
Available-for-sale securities, less than 12 months, unrealized loss	(26,958)	(363,193)
Available-for-sale securities, fair value	3,307,267	3,355,615
Debt Securities, Gross Unrealized Loss	(445,298)	(519,911)
Available-for-sale securities, greater than 12 months, fair value	3,029,054	970,844
Available-for-sale securities, greater than 12 months, unrealized loss	(418,340)	(156,718)
Term Loans [Member]
Available-for-sale securities, less than 12 months, fair value	8,705,391	6,309,005
Available-for-sale securities, less than 12 months, unrealized loss	(150,865)	(146,395)
Available-for-sale securities, fair value	8,705,391	6,309,005
Debt Securities, Gross Unrealized Loss	(150,865)	(146,395)
Collateralized Mortgage-Backed Securities [Member]
Available-for-sale securities, less than 12 months, fair value	9,426,743	10,358,560
Available-for-sale securities, less than 12 months, unrealized loss	(412,421)	(458,754)
Available-for-sale securities, fair value	13,632,001	13,639,692
Debt Securities, Gross Unrealized Loss	(1,072,670)	(1,074,520)
Available-for-sale securities, greater than 12 months, fair value	4,205,258	3,281,132
Available-for-sale securities, greater than 12 months, unrealized loss	$ (660,249)	$ (615,766)