Note 2 - Investments - Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Investments (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale, Amortized Cost	$ 83,785,307	$ 78,653,792
Debt Securities, Gross Unrealized Gains	856,381	783,438
Debt Securities, Gross Unrealized Losses	(5,063,509)	(4,927,710)
Debt Securities Fair Value	79,578,179	74,509,520
US Treasury Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	799,543	790,976
Debt Securities, Gross Unrealized Gains	0	0
Debt Securities, Gross Unrealized Losses	(88,166)	(66,308)
Debt Securities Fair Value	711,377	724,668
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	24,370,244	20,234,444
Debt Securities, Gross Unrealized Gains	111,868	95,085
Debt Securities, Gross Unrealized Losses	(2,990,292)	(2,516,167)
Debt Securities Fair Value	21,491,820	17,813,362
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	5,416,888	6,207,596
Debt Securities, Gross Unrealized Gains	0	4,044
Debt Securities, Gross Unrealized Losses	(675,739)	(575,547)
Debt Securities Fair Value	4,741,149	5,636,093
Redeemable Preferred Stock [Member]
Debt Securities, Available-for-Sale, Amortized Cost	2,562,893	3,622,572
Debt Securities, Gross Unrealized Gains	36	1,699
Debt Securities, Gross Unrealized Losses	(151,695)	(318,702)
Debt Securities Fair Value	2,411,234	3,305,569
Term Loans [Member]
Debt Securities, Available-for-Sale, Amortized Cost	12,971,452	17,177,179
Debt Securities, Gross Unrealized Gains	28,936	162,011
Debt Securities, Gross Unrealized Losses	(212,084)	(286,770)
Debt Securities Fair Value	12,788,304	17,052,420
Collateralized Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	37,664,287	30,621,025
Debt Securities, Gross Unrealized Gains	715,541	520,599
Debt Securities, Gross Unrealized Losses	(945,533)	(1,164,216)
Debt Securities Fair Value	$ 37,434,295	$ 29,977,408

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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