Note 2 - Investments - Fair Value of Securities in Unrealized Loss Position (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Fair value, less than 12 Months	$ 15,196,307	$ 8,971,631
Fair value, 12 months or longer	65,626,798	71,136,951
Fair value	80,823,105	80,108,582
Amortized cost, less than 12 Months	15,392,748	9,101,929
Amortized cost, 12 months or longer	75,142,853	80,111,469
Amortized cost	90,535,601	89,213,398
Unrealized loss, less than 12 Months	(196,441)	(130,298)
Unrealized loss, 12 months or longer	(9,516,055)	(8,974,518)
Unrealized loss	(9,712,496)	(9,104,816)
US Treasury Securities [Member]
Fair value, less than 12 Months	0	0
Fair value, 12 months or longer	1,295,211	1,289,774
Fair value	1,295,211	1,289,774
Amortized cost, less than 12 Months	0	0
Amortized cost, 12 months or longer	1,351,519	1,351,768
Amortized cost	1,351,519	1,351,768
Unrealized loss, less than 12 Months	0	0
Unrealized loss, 12 months or longer	(56,308)	(61,994)
Unrealized loss	(56,308)	(61,994)
MBS,ABS,CMBS [Member]
Fair value, less than 12 Months	8,671,226	8,345,340
Fair value, 12 months or longer	20,894,107	24,323,865
Fair value	29,565,333	32,669,205
Amortized cost, less than 12 Months	8,780,692	8,462,010
Amortized cost, 12 months or longer	23,622,850	26,870,852
Amortized cost	32,403,542	35,332,862
Unrealized loss, less than 12 Months	(109,466)	(116,670)
Unrealized loss, 12 months or longer	(2,728,743)	(2,546,987)
Unrealized loss	(2,838,209)	(2,663,657)
Corporate Debt Securities [Member]
Fair value, less than 12 Months	5,126,823	477,051
Fair value, 12 months or longer	31,263,210	33,352,754
Fair value	36,390,033	33,829,805
Amortized cost, less than 12 Months	5,205,614	478,370
Amortized cost, 12 months or longer	34,671,928	36,421,621
Amortized cost	39,877,542	36,899,991
Unrealized loss, less than 12 Months	(78,791)	(1,319)
Unrealized loss, 12 months or longer	(3,408,718)	(3,068,867)
Unrealized loss	(3,487,509)	(3,070,186)
US States and Political Subdivisions Debt Securities [Member]
Fair value, less than 12 Months	1,276,758	0
Fair value, 12 months or longer	12,114,730	12,149,238
Fair value	13,391,488	12,149,238
Amortized cost, less than 12 Months	1,283,254	0
Amortized cost, 12 months or longer	15,433,351	15,442,384
Amortized cost	16,716,605	15,442,384
Unrealized loss, less than 12 Months	(6,496)	0
Unrealized loss, 12 months or longer	(3,318,621)	(3,293,146)
Unrealized loss	(3,325,117)	(3,293,146)
Redeemable Preferred Stock [Member]
Fair value, less than 12 Months	121,500	149,240
Fair value, 12 months or longer	59,540	21,320
Fair value	181,040	170,560
Amortized cost, less than 12 Months	123,188	161,549
Amortized cost, 12 months or longer	63,205	24,844
Amortized cost	186,393	186,393
Unrealized loss, less than 12 Months	(1,688)	(12,309)
Unrealized loss, 12 months or longer	(3,665)	(3,524)
Unrealized loss	$ (5,353)	$ (15,833)