Note 2 - Investments - Fair Value of Securities in Unrealized Loss Position (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Fair value, less than 12 Months	$ 8,971,631	$ 61,194,560
Fair value, 12 months or longer	71,136,951	21,380,131
Fair value	80,108,582	82,574,691
Amortized cost, less than 12 Months	9,101,929	68,608,894
Amortized cost, 12 months or longer	80,111,469	25,325,968
Amortized cost	89,213,398	93,934,862
Unrealized loss, less than 12 Months	(130,298)	(7,414,334)
Unrealized loss, 12 months or longer	(8,974,518)	(3,945,837)
Unrealized loss	(9,104,816)	(11,360,171)
US Treasury Securities [Member]
Fair value, less than 12 Months	0	615,367
Fair value, 12 months or longer	1,289,774	637,594
Fair value	1,289,774	1,252,961
Amortized cost, less than 12 Months	0	652,424
Amortized cost, 12 months or longer	1,351,768	700,329
Amortized cost	1,351,768	1,352,753
Unrealized loss, less than 12 Months	0	(37,057)
Unrealized loss, 12 months or longer	(61,994)	(62,735)
Unrealized loss	(61,994)	(99,792)
MBS,ABS,CMBS [Member]
Fair value, less than 12 Months	8,345,340	21,199,819
Fair value, 12 months or longer	24,323,865	12,833,310
Fair value	32,669,205	34,033,129
Amortized cost, less than 12 Months	8,462,010	22,564,779
Amortized cost, 12 months or longer	26,870,852	14,575,082
Amortized cost	35,332,862	37,139,861
Unrealized loss, less than 12 Months	(116,670)	(1,364,960)
Unrealized loss, 12 months or longer	(2,546,987)	(1,741,772)
Unrealized loss	(2,663,657)	(3,106,732)
Corporate Debt Securities [Member]
Fair value, less than 12 Months	477,051	27,688,403
Fair value, 12 months or longer	33,352,754	5,829,396
Fair value	33,829,805	33,517,799
Amortized cost, less than 12 Months	478,370	30,584,890
Amortized cost, 12 months or longer	36,421,621	7,085,860
Amortized cost	36,899,991	37,670,750
Unrealized loss, less than 12 Months	(1,319)	(2,896,487)
Unrealized loss, 12 months or longer	(3,068,867)	(1,256,464)
Unrealized loss	(3,070,186)	(4,152,951)
US States and Political Subdivisions Debt Securities [Member]
Fair value, less than 12 Months	0	11,502,050
Fair value, 12 months or longer	12,149,238	2,079,831
Fair value	12,149,238	13,581,881
Amortized cost, less than 12 Months	0	14,590,996
Amortized cost, 12 months or longer	15,442,384	2,964,697
Amortized cost	15,442,384	17,555,693
Unrealized loss, less than 12 Months	0	(3,088,946)
Unrealized loss, 12 months or longer	(3,293,146)	(884,866)
Unrealized loss	(3,293,146)	(3,973,812)
Redeemable Preferred Stock [Member]
Fair value, less than 12 Months	149,240	188,921
Fair value, 12 months or longer	21,320	0
Fair value	170,560	188,921
Amortized cost, less than 12 Months	161,549	215,805
Amortized cost, 12 months or longer	24,844	0
Amortized cost	186,393	215,805
Unrealized loss, less than 12 Months	(12,309)	(26,884)
Unrealized loss, 12 months or longer	(3,524)	0
Unrealized loss	$ (15,833)	$ (26,884)