Note 2 - Investments - Fair Value of Securities in Unrealized Loss Position (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Fair value, less than 12 Months	$ 26,921,381	$ 61,194,560
Fair value, 12 months or longer	68,808,655	21,380,131
Fair value	95,730,036	82,574,691
Amortized cost, less than 12 Months	28,154,178	68,608,894
Amortized cost, 12 months or longer	81,416,039	25,325,968
Amortized cost	109,570,217	93,934,862
Unrealized loss, less than 12 Months	(1,232,797)	(7,414,334)
Unrealized loss, 12 months or longer	(12,607,384)	(3,945,837)
Unrealized loss	(13,840,181)	(11,360,171)
US Treasury Securities [Member]
Fair value, less than 12 Months	0	615,367
Fair value, 12 months or longer	1,265,703	637,594
Fair value	1,265,703	1,252,961
Amortized cost, less than 12 Months	0	652,424
Amortized cost, 12 months or longer	1,352,015	700,329
Amortized cost	1,352,015	1,352,753
Unrealized loss, less than 12 Months	0	(37,057)
Unrealized loss, 12 months or longer	(86,312)	(62,735)
Unrealized loss	(86,312)	(99,792)
MBS,ABS,CMBS [Member]
Fair value, less than 12 Months	14,212,477	21,199,819
Fair value, 12 months or longer	24,654,698	12,833,310
Fair value	38,867,175	34,033,129
Amortized cost, less than 12 Months	14,905,279	22,564,779
Amortized cost, 12 months or longer	28,166,054	14,575,082
Amortized cost	43,071,333	37,139,861
Unrealized loss, less than 12 Months	(692,802)	(1,364,960)
Unrealized loss, 12 months or longer	(3,511,356)	(1,741,772)
Unrealized loss	(4,204,158)	(3,106,732)
Corporate Debt Securities [Member]
Fair value, less than 12 Months	7,432,556	27,688,403
Fair value, 12 months or longer	31,742,390	5,829,396
Fair value	39,174,946	33,517,799
Amortized cost, less than 12 Months	7,772,987	30,584,890
Amortized cost, 12 months or longer	36,421,788	7,085,860
Amortized cost	44,194,775	37,670,750
Unrealized loss, less than 12 Months	(340,431)	(2,896,487)
Unrealized loss, 12 months or longer	(4,679,398)	(1,256,464)
Unrealized loss	(5,019,829)	(4,152,951)
US States and Political Subdivisions Debt Securities [Member]
Fair value, less than 12 Months	5,123,048	11,502,050
Fair value, 12 months or longer	11,123,964	2,079,831
Fair value	16,247,012	13,581,881
Amortized cost, less than 12 Months	5,314,363	14,590,996
Amortized cost, 12 months or longer	15,451,338	2,964,697
Amortized cost	20,765,701	17,555,693
Unrealized loss, less than 12 Months	(191,315)	(3,088,946)
Unrealized loss, 12 months or longer	(4,327,374)	(884,866)
Unrealized loss	(4,518,689)	(3,973,812)
Redeemable Preferred Stock [Member]
Fair value, less than 12 Months	153,300	188,921
Fair value, 12 months or longer	21,900	0
Fair value	175,200	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	(8,249)	(26,884)
Unrealized loss, 12 months or longer	(2,944)	0
Unrealized loss	$ (11,193)	$ (26,884)