Note 2 - Investments - Fair Value of Securities in Unrealized Loss Position (Details) - USD ($)	Jun. 30, 2024	Dec. 31, 2023
Fair value, less than 12 Months	$ 18,327,604	$ 8,971,631
Fair value, 12 months or longer	66,424,511	71,136,951
Fair value	84,752,115	80,108,582
Amortized cost, less than 12 Months	18,657,843	9,101,929
Amortized cost, 12 months or longer	76,281,180	80,111,469
Amortized cost	94,939,023	89,213,398
Unrealized loss, less than 12 Months	(330,239)	(130,298)
Unrealized loss, 12 months or longer	(9,856,669)	(8,974,518)
Unrealized loss	(10,186,908)	(9,104,816)
US Treasury Securities [Member]
Fair value, less than 12 Months	0	0
Fair value, 12 months or longer	1,305,930	1,289,774
Fair value	1,305,930	1,289,774
Amortized cost, less than 12 Months	0	0
Amortized cost, 12 months or longer	1,351,270	1,351,768
Amortized cost	1,351,270	1,351,768
Unrealized loss, less than 12 Months	0	0
Unrealized loss, 12 months or longer	(45,340)	(61,994)
Unrealized loss	(45,340)	(61,994)
MBS,ABS,CMBS [Member]
Fair value, less than 12 Months	6,933,780	8,345,340
Fair value, 12 months or longer	22,571,843	24,323,865
Fair value	29,505,623	32,669,205
Amortized cost, less than 12 Months	7,038,812	8,462,010
Amortized cost, 12 months or longer	25,411,046	26,870,852
Amortized cost	32,449,858	35,332,862
Unrealized loss, less than 12 Months	(105,032)	(116,670)
Unrealized loss, 12 months or longer	(2,839,203)	(2,546,987)
Unrealized loss	(2,944,235)	(2,663,657)
Corporate Debt Securities [Member]
Fair value, less than 12 Months	6,850,575	477,051
Fair value, 12 months or longer	30,480,416	33,352,754
Fair value	37,330,991	33,829,805
Amortized cost, less than 12 Months	7,011,243	478,370
Amortized cost, 12 months or longer	33,985,175	36,421,621
Amortized cost	40,996,418	36,899,991
Unrealized loss, less than 12 Months	(160,668)	(1,319)
Unrealized loss, 12 months or longer	(3,504,759)	(3,068,867)
Unrealized loss	(3,665,427)	(3,070,186)
US States and Political Subdivisions Debt Securities [Member]
Fair value, less than 12 Months	4,470,276	0
Fair value, 12 months or longer	11,966,015	12,149,238
Fair value	16,436,291	12,149,238
Amortized cost, less than 12 Months	4,530,820	0
Amortized cost, 12 months or longer	15,424,264	15,442,384
Amortized cost	19,955,084	15,442,384
Unrealized loss, less than 12 Months	(60,544)	0
Unrealized loss, 12 months or longer	(3,458,249)	(3,293,146)
Unrealized loss	(3,518,793)	(3,293,146)
Redeemable Preferred Stock [Member]
Fair value, less than 12 Months	72,973	149,240
Fair value, 12 months or longer	100,307	21,320
Fair value	173,280	170,560
Amortized cost, less than 12 Months	76,968	161,549
Amortized cost, 12 months or longer	109,425	24,844
Amortized cost	186,393	186,393
Unrealized loss, less than 12 Months	(3,995)	(12,309)
Unrealized loss, 12 months or longer	(9,118)	(3,524)
Unrealized loss	$ (13,113)	$ (15,833)