Note 2 - Investments - Gross Unrealized Losses (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Available-for-sale securities, less than 12 months, fair value	$ 13,794,527	$ 14,800,459
Available-for-sale securities, less than 12 months, unrealized loss	(358,293)	(466,864)
Available-for-sale securities, greater than 12 months, fair value	25,810,566	33,547,892
Available-for-sale securities, greater than 12 months, unrealized loss	(4,705,216)	(4,460,846)
Available-for-sale securities, fair value	39,605,093	48,348,351
Debt Securities, Gross Unrealized Loss	(5,063,509)	(4,927,710)
US Treasury Securities [Member]
Available-for-sale securities, less than 12 months, fair value	444,105	724,668
Available-for-sale securities, less than 12 months, unrealized loss	(7,244)	(66,308)
Available-for-sale securities, greater than 12 months, fair value	267,272
Available-for-sale securities, greater than 12 months, unrealized loss	(80,922)
Available-for-sale securities, fair value	711,377	724,668
Debt Securities, Gross Unrealized Loss	(88,166)	(66,308)
Corporate Debt Securities [Member]
Available-for-sale securities, less than 12 months, fair value	1,959,130	262,673
Available-for-sale securities, less than 12 months, unrealized loss	(52,671)	(863)
Available-for-sale securities, greater than 12 months, fair value	12,336,095	15,653,914
Available-for-sale securities, greater than 12 months, unrealized loss	(2,937,621)	(2,515,304)
Available-for-sale securities, fair value	14,295,225	15,916,587
Debt Securities, Gross Unrealized Loss	(2,990,292)	(2,516,167)
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities, less than 12 months, fair value	1,190,019	523,744
Available-for-sale securities, less than 12 months, unrealized loss	(56,801)	(4,792)
Available-for-sale securities, greater than 12 months, fair value	3,551,130	4,825,568
Available-for-sale securities, greater than 12 months, unrealized loss	(618,938)	(570,755)
Available-for-sale securities, fair value	4,741,149	5,349,312
Debt Securities, Gross Unrealized Loss	(675,739)	(575,547)
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, greater than 12 months, fair value	2,337,770	3,182,131
Available-for-sale securities, greater than 12 months, unrealized loss	(151,695)	(318,702)
Available-for-sale securities, fair value	2,337,770	3,305,569
Debt Securities, Gross Unrealized Loss	(151,695)	(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, greater than 12 months, fair value	2,609,831	3,534,621
Available-for-sale securities, greater than 12 months, unrealized loss	(212,084)	(111,815)
Available-for-sale securities, fair value	2,609,831	7,274,480
Debt Securities, Gross Unrealized Loss	(212,084)	(286,770)
Commercial Mortgage-Backed Securities [Member]
Available-for-sale securities, less than 12 months, fair value	10,201,273	9,549,515
Available-for-sale securities, less than 12 months, unrealized loss	(241,577)	(219,946)
Available-for-sale securities, greater than 12 months, fair value	4,708,468	6,228,220
Available-for-sale securities, greater than 12 months, unrealized loss	(703,956)	(944,270)
Available-for-sale securities, fair value	14,909,741	15,777,735
Debt Securities, Gross Unrealized Loss	$ (945,533)	$ (1,164,216)