Note 2 - Investments - Fair Value of Securities in Unrealized Loss Position (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Fair value, less than 12 Months	$ 28,263,317	$ 61,194,560
Fair value, 12 months or longer	52,028,366	21,380,131
Fair value	80,291,683	82,574,691
Amortized cost, less than 12 Months	29,491,647	68,608,894
Amortized cost, 12 months or longer	60,303,715	25,325,968
Amortized cost	89,795,362	93,934,862
Unrealized loss, less than 12 Months	(1,228,329)	(7,414,334)
Unrealized loss, 12 months or longer	(8,275,349)	(3,945,837)
Unrealized loss	(9,503,679)	(11,360,171)
US Treasury Securities [Member]
Fair value, less than 12 Months	0	615,367
Fair value, 12 months or longer	1,270,102	637,594
Fair value	1,270,102	1,252,961
Amortized cost, less than 12 Months	0	652,424
Amortized cost, 12 months or longer	1,352,510	700,329
Amortized cost	1,352,510	1,352,753
Unrealized loss, less than 12 Months	0	(37,057)
Unrealized loss, 12 months or longer	(82,409)	(62,735)
Unrealized loss	(82,409)	(99,792)
MBS,ABS,CMBS [Member]
Fair value, less than 12 Months	8,486,970	21,199,819
Fair value, 12 months or longer	23,680,223	12,833,310
Fair value	32,167,193	34,033,129
Amortized cost, less than 12 Months	8,765,241	22,564,779
Amortized cost, 12 months or longer	26,084,857	14,575,082
Amortized cost	34,850,098	37,139,861
Unrealized loss, less than 12 Months	(278,271)	(1,364,960)
Unrealized loss, 12 months or longer	(2,404,634)	(1,741,772)
Unrealized loss	(2,682,905)	(3,106,732)
Corporate Debt Securities [Member]
Fair value, less than 12 Months	17,022,608	27,688,403
Fair value, 12 months or longer	16,761,188	5,829,396
Fair value	33,783,797	33,517,799
Amortized cost, less than 12 Months	17,757,398	30,584,890
Amortized cost, 12 months or longer	19,532,444	7,085,860
Amortized cost	37,289,842	37,670,750
Unrealized loss, less than 12 Months	(734,790)	(2,896,487)
Unrealized loss, 12 months or longer	(2,771,256)	(1,256,464)
Unrealized loss	(3,506,045)	(4,152,951)
US States and Political Subdivisions Debt Securities [Member]
Fair value, less than 12 Months	2,456,155	11,502,050
Fair value, 12 months or longer	10,316,853	2,079,831
Fair value	12,773,008	13,581,881
Amortized cost, less than 12 Months	2,660,564	14,590,996
Amortized cost, 12 months or longer	13,333,904	2,964,697
Amortized cost	15,994,468	17,555,693
Unrealized loss, less than 12 Months	(204,409)	(3,088,946)
Unrealized loss, 12 months or longer	(3,017,050)	(884,866)
Unrealized loss	(3,221,460)	(3,973,812)
Redeemable Preferred Stock [Member]
Fair value, less than 12 Months	297,584	188,921
Fair value, 12 months or longer	0	0
Fair value	297,584	188,921
Amortized cost, less than 12 Months	308,444	215,805
Amortized cost, 12 months or longer	0	0
Amortized cost	308,444	215,805
Unrealized loss, less than 12 Months	(10,860)	(26,884)
Unrealized loss, 12 months or longer	0	0
Unrealized loss	$ (10,860)	$ (26,884)