Note 2 - Investments - Gross Unrealized Losses (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Available-for-sale securities, less than 12 months, fair value	$ 24,933,639	$ 36,541,093
Available-for-sale securities, less than 12 months, unrealized loss	(935,140)	(3,444,132)
Available-for-sale securities, fair value	48,248,020	44,708,495
Debt Securities, Gross Unrealized Loss	(5,321,918)	(5,704,466)
Available-for-sale securities, greater than 12 months, fair value	23,314,381	8,167,402
Available-for-sale securities, greater than 12 months, unrealized loss	(4,386,778)	(2,260,334)
US Treasury Securities [Member]
Available-for-sale securities, less than 12 months, fair value	726,745	398,375
Available-for-sale securities, less than 12 months, unrealized loss	(59,515)	(5,031)
Available-for-sale securities, fair value	726,745	398,375
Debt Securities, Gross Unrealized Loss	(59,515)	(5,031)
Corporate Debt Securities [Member]
Available-for-sale securities, less than 12 months, fair value	2,756,472	12,378,486
Available-for-sale securities, less than 12 months, unrealized loss	(182,014)	(1,883,706)
Available-for-sale securities, fair value	15,864,044	15,585,399
Debt Securities, Gross Unrealized Loss	(2,918,435)	(3,150,382)
Available-for-sale securities, greater than 12 months, fair value	13,107,572	3,206,913
Available-for-sale securities, greater than 12 months, unrealized loss	(2,736,421)	(1,266,676)
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities, less than 12 months, fair value	2,184,086	4,711,896
Available-for-sale securities, less than 12 months, unrealized loss	(87,433)	(587,053)
Available-for-sale securities, fair value	5,259,630	5,420,410
Debt Securities, Gross Unrealized Loss	(596,541)	(808,227)
Available-for-sale securities, greater than 12 months, fair value	3,075,544	708,514
Available-for-sale securities, greater than 12 months, unrealized loss	(509,108)	(221,174)
Redeemable Preferred Stock [Member]
Available-for-sale securities, less than 12 months, fair value	209,131	2,384,771
Available-for-sale securities, less than 12 months, unrealized loss	(9,974)	(363,193)
Available-for-sale securities, fair value	3,153,604	3,355,615
Debt Securities, Gross Unrealized Loss	(411,828)	(519,911)
Available-for-sale securities, greater than 12 months, fair value	2,944,473	970,844
Available-for-sale securities, greater than 12 months, unrealized loss	(401,854)	(156,718)
Term Loans [Member]
Available-for-sale securities, less than 12 months, fair value	8,701,430	6,309,005
Available-for-sale securities, less than 12 months, unrealized loss	(157,149)	(146,395)
Available-for-sale securities, fair value	8,701,430	6,309,005
Debt Securities, Gross Unrealized Loss	(157,149)	(146,395)
Collateralized Mortgage-Backed Securities [Member]
Available-for-sale securities, less than 12 months, fair value	10,355,775	10,358,560
Available-for-sale securities, less than 12 months, unrealized loss	(439,055)	(458,754)
Available-for-sale securities, fair value	14,542,567	13,639,692
Debt Securities, Gross Unrealized Loss	(1,178,450)	(1,074,520)
Available-for-sale securities, greater than 12 months, fair value	4,186,792	3,281,132
Available-for-sale securities, greater than 12 months, unrealized loss	$ (739,395)	$ (615,766)