Note 2 - Investments - Gross Unrealized Losses (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Available-for-sale securities, less than 12 months, fair value	$ 5,237,436	$ 14,800,459
Available-for-sale securities, less than 12 months, unrealized loss	(184,549)	(466,864)
Available-for-sale securities, fair value	32,343,516	48,348,351
Debt Securities, Gross Unrealized Loss	(3,502,161)	(4,927,710)
Available-for-sale securities, greater than 12 months, fair value	27,106,080	33,547,892
Available-for-sale securities, greater than 12 months, unrealized loss	(3,317,612)	(4,460,846)
US Treasury Securities [Member]
Available-for-sale securities, less than 12 months, fair value	0	724,668
Available-for-sale securities, less than 12 months, unrealized loss	0	(66,308)
Available-for-sale securities, fair value	289,974	724,668
Debt Securities, Gross Unrealized Loss	(56,967)	(66,308)
Corporate Debt Securities [Member]
Available-for-sale securities, less than 12 months, fair value	0	262,673
Available-for-sale securities, less than 12 months, unrealized loss	0	(863)
Available-for-sale securities, fair value	13,162,902	15,916,587
Debt Securities, Gross Unrealized Loss	(2,129,319)	(2,516,167)
Available-for-sale securities, greater than 12 months, fair value	13,162,902	15,653,914
Available-for-sale securities, greater than 12 months, unrealized loss	(2,129,319)	(2,515,304)
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities, less than 12 months, fair value	279,531	523,744
Available-for-sale securities, less than 12 months, unrealized loss	(2,651)	(4,792)
Available-for-sale securities, fair value	4,021,190	5,349,312
Debt Securities, Gross Unrealized Loss	(438,190)	(575,547)
Available-for-sale securities, greater than 12 months, fair value	3,741,659	4,825,568
Available-for-sale securities, greater than 12 months, unrealized loss	(435,539)	(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	2,376,031	3,305,569
Debt Securities, Gross Unrealized Loss	(114,353)	(318,702)
Available-for-sale securities, greater than 12 months, fair value	2,376,031	3,305,569
Available-for-sale securities, greater than 12 months, unrealized loss	(114,353)	(318,702)
Term Loans [Member]
Available-for-sale securities, less than 12 months, fair value	0	3,739,859
Available-for-sale securities, less than 12 months, unrealized loss	0	(174,955)
Available-for-sale securities, fair value	2,470,314	7,274,480
Debt Securities, Gross Unrealized Loss	(12,117)	(286,770)
Collateralized Mortgage-Backed Securities [Member]
Available-for-sale securities, less than 12 months, fair value	4,957,905	9,549,515
Available-for-sale securities, less than 12 months, unrealized loss	(181,898)	(219,946)
Available-for-sale securities, fair value	10,023,105	15,777,735
Debt Securities, Gross Unrealized Loss	(751,215)	(1,164,216)
Available-for-sale securities, greater than 12 months, fair value	5,065,200	6,228,220
Available-for-sale securities, greater than 12 months, unrealized loss	$ (569,317)	$ (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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