Note 2 - Investments - Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Investments (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Cost or Amortized Cost	$ 80,998,137	$ 78,653,792
Debt securities, gross unrealized gains	1,368,086	783,438
Debt Securities, Gross Unrealized Losses	(3,502,161)	(4,927,710)
Debt securities, fair value	78,864,062	74,509,520
US Treasury Securities [Member]
Cost or Amortized Cost	798,365	790,976
Debt securities, gross unrealized gains	1,314	0
Debt Securities, Gross Unrealized Losses	(56,967)	(66,308)
Debt securities, fair value	742,712	724,668
Corporate Debt Securities [Member]
Cost or Amortized Cost	19,863,377	20,234,444
Debt securities, gross unrealized gains	180,815	95,085
Debt Securities, Gross Unrealized Losses	(2,129,319)	(2,516,167)
Debt securities, fair value	17,914,873	17,813,362
US States and Political Subdivisions Debt Securities [Member]
Cost or Amortized Cost	5,170,581	6,207,596
Debt securities, gross unrealized gains	6,448	4,044
Debt Securities, Gross Unrealized Losses	(438,190)	(575,547)
Debt securities, fair value	4,738,839	5,636,093
Redeemable Preferred Stock [Member]
Cost or Amortized Cost	2,563,224	3,622,572
Debt securities, gross unrealized gains	619	1,699
Debt Securities, Gross Unrealized Losses	(114,353)	(318,702)
Debt securities, fair value	2,449,490	3,305,569
Term Loans [Member]
Cost or Amortized Cost	16,558,603	17,177,179
Debt securities, gross unrealized gains	36,266	162,011
Debt Securities, Gross Unrealized Losses	(12,117)	(286,770)
Debt securities, fair value	16,582,752	17,052,420
Collateralized Mortgage-Backed Securities [Member]
Cost or Amortized Cost	36,043,987	30,621,025
Debt securities, gross unrealized gains	1,142,624	520,599
Debt Securities, Gross Unrealized Losses	(751,215)	(1,164,216)
Debt securities, fair value	$ 36,435,396	$ 29,977,408