Note 2 - Investments - Gross Unrealized Losses (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Available-for-sale securities, less than 12 months, fair value	$ 7,651,949	$ 14,800,459
Available-for-sale securities, less than 12 months, unrealized loss	(136,935)	(466,864)
Available-for-sale securities, fair value	45,031,547	48,348,351
Debt Securities, Gross Unrealized Loss	(4,871,684)	(4,927,710)
Available-for-sale securities, greater than 12 months, fair value	37,379,598	33,547,892
Available-for-sale securities, greater than 12 months, unrealized loss	(4,734,749)	(4,460,846)
US Treasury Securities [Member]
Available-for-sale securities, less than 12 months, fair value	441,492	724,668
Available-for-sale securities, less than 12 months, unrealized loss	(10,075)	(66,308)
Available-for-sale securities, fair value	713,469	724,668
Debt Securities, Gross Unrealized Loss	(78,212)	(66,308)
Corporate Debt Securities [Member]
Available-for-sale securities, less than 12 months, fair value	499,563	262,673
Available-for-sale securities, less than 12 months, unrealized loss	(5,081)	(863)
Available-for-sale securities, fair value	15,050,942	15,916,587
Debt Securities, Gross Unrealized Loss	(2,795,376)	(2,516,167)
Available-for-sale securities, greater than 12 months, fair value	14,551,379	15,653,914
Available-for-sale securities, greater than 12 months, unrealized loss	(2,790,295)	(2,515,304)
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities, less than 12 months, fair value	745,637	523,744
Available-for-sale securities, less than 12 months, unrealized loss	(13,356)	(4,792)
Available-for-sale securities, fair value	5,094,180	5,349,312
Debt Securities, Gross Unrealized Loss	(588,471)	(575,547)
Available-for-sale securities, greater than 12 months, fair value	4,348,543	4,825,568
Available-for-sale securities, greater than 12 months, unrealized loss	(575,115)	(570,755)
Redeemable Preferred Stock [Member]
Available-for-sale securities, less than 12 months, fair value	0	0
Available-for-sale securities, less than 12 months, unrealized loss	0	0
Available-for-sale securities, fair value	3,300,478	3,305,569
Debt Securities, Gross Unrealized Loss	(196,668)	(318,702)
Available-for-sale securities, greater than 12 months, fair value	3,300,478	3,305,569
Available-for-sale securities, greater than 12 months, unrealized loss	(196,668)	(318,702)
Term Loans [Member]
Available-for-sale securities, less than 12 months, fair value	155,150	3,739,859
Available-for-sale securities, less than 12 months, unrealized loss	(2,076)	(174,955)
Available-for-sale securities, fair value	7,717,040	7,274,480
Debt Securities, Gross Unrealized Loss	(290,534)	(286,770)
Collateralized Mortgage-Backed Securities [Member]
Available-for-sale securities, less than 12 months, fair value	5,810,107	9,549,515
Available-for-sale securities, less than 12 months, unrealized loss	(106,347)	(219,946)
Available-for-sale securities, fair value	13,155,438	15,777,735
Debt Securities, Gross Unrealized Loss	(922,423)	(1,164,216)
Available-for-sale securities, greater than 12 months, fair value	7,345,331	6,228,220
Available-for-sale securities, greater than 12 months, unrealized loss	$ (816,076)	$ (944,270)

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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