Note 2 - Investments - Fair Value of Securities in Unrealized Loss Position (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Fair value, less than 12 Months	$ 61,194,560	$ 29,899,225
Fair value, 12 months or longer	21,380,131	2,680,468
Fair value	82,574,691	32,579,693
Amortized cost, less than 12 Months	68,608,894	30,333,472
Amortized cost, 12 months or longer	25,325,968	2,770,476
Amortized cost	93,934,862	33,103,948
Unrealized loss, less than 12 Months	(7,414,334)	(434,247)
Unrealized loss, 12 months or longer	(3,945,837)	(90,008)
Unrealized loss	(11,360,171)	(524,255)
US Treasury Securities [Member]
Fair value, less than 12 Months	615,367	391,250
Fair value, 12 months or longer	637,594	291,891
Fair value	1,252,961	683,141
Amortized cost, less than 12 Months	652,424	400,408
Amortized cost, 12 months or longer	700,329	300,061
Amortized cost	1,352,753	700,469
Unrealized loss, less than 12 Months	(37,057)	(9,158)
Unrealized loss, 12 months or longer	(62,735)	(8,170)
Unrealized loss	(99,792)	(17,328)
MBS,ABS,CMBS [Member]
Fair value, less than 12 Months	21,199,819	20,403,757
Fair value, 12 months or longer	12,833,310	1,124,095
Fair value	34,033,129	21,527,852
Amortized cost, less than 12 Months	22,564,779	20,647,568
Amortized cost, 12 months or longer	14,575,082	1,176,171
Amortized cost	37,139,861	21,823,739
Unrealized loss, less than 12 Months	(1,364,960)	(243,811)
Unrealized loss, 12 months or longer	(1,741,772)	(52,076)
Unrealized loss	(3,106,732)	(295,887)
Corporate Debt Securities [Member]
Fair value, less than 12 Months	27,688,403	6,428,166
Fair value, 12 months or longer	5,829,396	995,235
Fair value	33,517,799	7,423,401
Amortized cost, less than 12 Months	30,584,890	6,590,227
Amortized cost, 12 months or longer	7,085,860	1,020,853
Amortized cost	37,670,750	7,611,080
Unrealized loss, less than 12 Months	(2,896,487)	(162,061)
Unrealized loss, 12 months or longer	(1,256,464)	(25,618)
Unrealized loss	(4,152,951)	(187,679)
US States and Political Subdivisions Debt Securities [Member]
Fair value, less than 12 Months	11,502,050	2,676,052
Fair value, 12 months or longer	2,079,831	269,247
Fair value	13,581,881	2,945,299
Amortized cost, less than 12 Months	14,590,996	2,695,269
Amortized cost, 12 months or longer	2,964,697	273,391
Amortized cost	17,555,693	2,968,660
Unrealized loss, less than 12 Months	(3,088,946)	(19,217)
Unrealized loss, 12 months or longer	(884,866)	(4,144)
Unrealized loss	(3,973,812)	(23,361)
Redeemable Preferred Stock [Member]
Fair value, less than 12 Months	188,921	0
Fair value, 12 months or longer	0	0
Fair value	188,921	0
Amortized cost, less than 12 Months	215,805	0
Amortized cost, 12 months or longer	0	0
Amortized cost	215,805	0
Unrealized loss, less than 12 Months	(26,884)	0
Unrealized loss, 12 months or longer	0	0
Unrealized loss	$ (26,884)	$ 0