Note 2 - Investments - Fair Value of Securities in Unrealized Loss Position (Details) - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Fair value, less than 12 Months	$ 72,322,225	$ 29,899,225
Fair value, 12 months or longer	14,881,737	2,680,468
Fair value	87,203,962	32,579,693
Amortized cost, less than 12 Months	81,423,171	30,333,472
Amortized cost, 12 months or longer	17,796,585	2,770,476
Amortized cost	99,219,756	33,103,948
Unrealized loss, less than 12 Months	(9,100,946)	(434,247)
Unrealized loss, 12 months or longer	(2,914,848)	(90,008)
Unrealized loss	(12,015,794)	(524,255)
US Treasury Securities [Member]
Fair value, less than 12 Months	613,609	391,250
Fair value, 12 months or longer	632,109	291,891
Fair value	1,245,718	683,141
Amortized cost, less than 12 Months	652,633	400,408
Amortized cost, 12 months or longer	700,364	300,061
Amortized cost	1,352,997	700,469
Unrealized loss, less than 12 Months	(39,024)	(9,158)
Unrealized loss, 12 months or longer	(68,255)	(8,170)
Unrealized loss	(107,279)	(17,328)
MBS,ABS,CMBS [Member]
Fair value, less than 12 Months	27,169,391	20,403,757
Fair value, 12 months or longer	9,308,869	1,124,095
Fair value	36,478,260	21,527,852
Amortized cost, less than 12 Months	29,014,459	20,647,568
Amortized cost, 12 months or longer	10,785,893	1,176,171
Amortized cost	39,800,352	21,823,739
Unrealized loss, less than 12 Months	(1,845,068)	(243,811)
Unrealized loss, 12 months or longer	(1,477,024)	(52,076)
Unrealized loss	(3,322,092)	(295,887)
Corporate Debt Securities [Member]
Fair value, less than 12 Months	30,368,813	6,428,166
Fair value, 12 months or longer	4,359,237	995,235
Fair value	34,728,050	7,423,401
Amortized cost, less than 12 Months	33,917,388	6,590,227
Amortized cost, 12 months or longer	5,537,273	1,020,853
Amortized cost	39,454,661	7,611,080
Unrealized loss, less than 12 Months	(3,548,575)	(162,061)
Unrealized loss, 12 months or longer	(1,178,036)	(25,618)
Unrealized loss	(4,726,611)	(187,679)
US States and Political Subdivisions Debt Securities [Member]
Fair value, less than 12 Months	14,034,490	2,676,052
Fair value, 12 months or longer	581,522	269,247
Fair value	14,616,012	2,945,299
Amortized cost, less than 12 Months	17,691,796	2,695,269
Amortized cost, 12 months or longer	773,055	273,391
Amortized cost	18,464,851	2,968,660
Unrealized loss, less than 12 Months	(3,657,306)	(19,217)
Unrealized loss, 12 months or longer	(191,533)	(4,144)
Unrealized loss	(3,848,839)	(23,361)
Redeemable Preferred Stock [Member]
Fair value, less than 12 Months	135,922	0
Fair value, 12 months or longer	0	0
Fair value	135,922	0
Amortized cost, less than 12 Months	146,895	0
Amortized cost, 12 months or longer	0	0
Amortized cost	146,895	0
Unrealized loss, less than 12 Months	(10,973)	0
Unrealized loss, 12 months or longer	0	0
Unrealized loss	$ (10,973)	$ 0