Note 2 - Investments - Gross Unrealized Losses (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Available-for-sale securities, less than 12 months, fair value	$ 14,800,459	$ 36,541,093
Available-for-sale securities, less than 12 months, unrealized loss	(466,864)	(3,444,132)
Available-for-sale securities, fair value	48,224,913	44,708,495
Debt Securities, Gross Unrealized Loss	(4,927,710)	(5,704,466)
Available-for-sale securities, greater than 12 months, fair value	33,424,454	8,167,402
Available-for-sale securities, greater than 12 months, unrealized loss	(4,460,846)	(2,260,334)
US Treasury Securities [Member]
Available-for-sale securities, less than 12 months, fair value	724,668	398,375
Available-for-sale securities, less than 12 months, unrealized loss	(66,308)	(5,031)
Available-for-sale securities, fair value	724,668	398,375
Debt Securities, Gross Unrealized Loss	(66,308)	(5,031)
Corporate Debt Securities [Member]
Available-for-sale securities, less than 12 months, fair value	262,673	12,378,486
Available-for-sale securities, less than 12 months, unrealized loss	(863)	(1,883,706)
Available-for-sale securities, fair value	15,916,587	15,585,399
Debt Securities, Gross Unrealized Loss	(2,516,167)	(3,150,382)
Available-for-sale securities, greater than 12 months, fair value	15,653,914	3,206,913
Available-for-sale securities, greater than 12 months, unrealized loss	(2,515,304)	(1,266,676)
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities, less than 12 months, fair value	523,744	4,711,896
Available-for-sale securities, less than 12 months, unrealized loss	(4,792)	(587,053)
Available-for-sale securities, fair value	5,349,312	5,420,410
Debt Securities, Gross Unrealized Loss	(575,547)	(808,227)
Available-for-sale securities, greater than 12 months, fair value	4,825,568	708,514
Available-for-sale securities, greater than 12 months, unrealized loss	(570,755)	(221,174)
Redeemable Preferred Stock [Member]
Available-for-sale securities, less than 12 months, fair value	0	2,384,771
Available-for-sale securities, less than 12 months, unrealized loss	0	(363,193)
Available-for-sale securities, fair value	3,182,131	3,355,615
Debt Securities, Gross Unrealized Loss	(318,702)	(519,911)
Available-for-sale securities, greater than 12 months, fair value	3,182,131	970,844
Available-for-sale securities, greater than 12 months, unrealized loss	(318,702)	(156,718)
Term Loans [Member]
Available-for-sale securities, less than 12 months, fair value	3,739,859	6,309,005
Available-for-sale securities, less than 12 months, unrealized loss	(174,955)	(146,395)
Available-for-sale securities, fair value	7,274,480	6,309,005
Debt Securities, Gross Unrealized Loss	(286,770)	(146,395)
Collateralized Mortgage-Backed Securities [Member]
Available-for-sale securities, less than 12 months, fair value	9,549,515	10,358,560
Available-for-sale securities, less than 12 months, unrealized loss	(219,946)	(458,754)
Available-for-sale securities, fair value	15,777,735	13,639,692
Debt Securities, Gross Unrealized Loss	(1,164,216)	(1,074,520)
Available-for-sale securities, greater than 12 months, fair value	6,228,220	3,281,132
Available-for-sale securities, greater than 12 months, unrealized loss	$ (944,270)	$ (615,766)

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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