Note 2 - Investments - Fair Value of Securities in Unrealized Loss Position (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Fair value, less than 12 Months	$ 1,304,022	$ 8,971,631
Fair value, 12 months or longer	62,551,076	71,136,951
Fair value	63,855,098	80,108,582
Amortized cost, less than 12 Months	1,305,061	9,101,929
Amortized cost, 12 months or longer	69,710,208	80,111,469
Amortized cost	71,015,269	89,213,398
Unrealized loss, less than 12 Months	(1,039)	(130,298)
Unrealized loss, 12 months or longer	(7,159,132)	(8,974,518)
Unrealized loss	(7,160,171)	(9,104,816)
US Treasury Securities [Member]
Fair value, less than 12 Months	0	0
Fair value, 12 months or longer	1,326,055	1,289,774
Fair value	1,326,055	1,289,774
Amortized cost, less than 12 Months	0	0
Amortized cost, 12 months or longer	1,351,018	1,351,768
Amortized cost	1,351,018	1,351,768
Unrealized loss, less than 12 Months	0	0
Unrealized loss, 12 months or longer	(24,963)	(61,994)
Unrealized loss	(24,963)	(61,994)
MBS,ABS,CMBS [Member]
Fair value, less than 12 Months	505,082	8,345,340
Fair value, 12 months or longer	19,582,844	24,323,865
Fair value	20,087,926	32,669,205
Amortized cost, less than 12 Months	505,315	8,462,010
Amortized cost, 12 months or longer	21,506,868	26,870,852
Amortized cost	22,012,183	35,332,862
Unrealized loss, less than 12 Months	(233)	(116,670)
Unrealized loss, 12 months or longer	(1,924,024)	(2,546,987)
Unrealized loss	(1,924,257)	(2,663,657)
Corporate Debt Securities [Member]
Fair value, less than 12 Months	0	477,051
Fair value, 12 months or longer	28,991,279	33,352,754
Fair value	28,991,279	33,829,805
Amortized cost, less than 12 Months	0	478,370
Amortized cost, 12 months or longer	31,327,802	36,421,621
Amortized cost	31,327,802	36,899,991
Unrealized loss, less than 12 Months	0	(1,319)
Unrealized loss, 12 months or longer	(2,336,523)	(3,068,867)
Unrealized loss	(2,336,523)	(3,070,186)
US States and Political Subdivisions Debt Securities [Member]
Fair value, less than 12 Months	776,030	0
Fair value, 12 months or longer	12,544,802	12,149,238
Fair value	13,320,832	12,149,238
Amortized cost, less than 12 Months	776,741	0
Amortized cost, 12 months or longer	15,415,095	15,442,384
Amortized cost	16,191,836	15,442,384
Unrealized loss, less than 12 Months	(711)	0
Unrealized loss, 12 months or longer	(2,870,293)	(3,293,146)
Unrealized loss	(2,871,004)	(3,293,146)
Redeemable Preferred Stock [Member]
Fair value, less than 12 Months	22,910	149,240
Fair value, 12 months or longer	106,096	21,320
Fair value	129,006	170,560
Amortized cost, less than 12 Months	23,005	161,549
Amortized cost, 12 months or longer	109,425	24,844
Amortized cost	132,430	186,393
Unrealized loss, less than 12 Months	(95)	(12,309)
Unrealized loss, 12 months or longer	(3,329)	(3,524)
Unrealized loss	$ (3,424)	$ (15,833)