Investments - Schedule of securities with unrealized losses (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2025 USD ($) position	Dec. 31, 2024 USD ($) position
U.S. Treasury securities and obligations of U.S. government corporations and agencies
Net Investment Income [Line Items]
Estimated fair value - less than 12 months	$ 0	$ 0
Unrealized losses - less than 12 months	$ 0	$ 0
Number of positions held - less than 12 months | position	0	0
Estimated fair value - 12 months or more	$ 0	$ 0
Unrealized losses - 12 months or more	$ 0	$ 0
Number of positions held - 12 months or more | position	0	0
Estimated fair value - total	$ 0	$ 0
Unrealized losses - total	0	0
Political subdivisions of States, Territories and Possessions
Net Investment Income [Line Items]
Estimated fair value - less than 12 months	0	7,705,370
Unrealized losses - less than 12 months	$ 0	$ (73,589)
Number of positions held - less than 12 months | position	0	6
Estimated fair value - 12 months or more	$ 13,539,593	$ 13,167,726
Unrealized losses - 12 months or more	$ (2,945,087)	$ (3,324,491)
Number of positions held - 12 months or more | position	12	12
Estimated fair value - total	$ 13,539,593	$ 20,873,096
Unrealized losses - total	(2,945,087)	(3,398,080)
Corporate and other bonds industrial and miscellaneous
Net Investment Income [Line Items]
Estimated fair value - less than 12 months	51,949,158	51,411,296
Unrealized losses - less than 12 months	$ (495,587)	$ (1,024,461)
Number of positions held - less than 12 months | position	60	60
Estimated fair value - 12 months or more	$ 51,520,947	$ 55,381,083
Unrealized losses - 12 months or more	$ (3,992,684)	$ (4,690,597)
Number of positions held - 12 months or more | position	63	68
Estimated fair value - total	$ 103,470,105	$ 106,792,379
Unrealized losses - total	(4,488,271)	(5,715,058)
Residential mortgage and other asset backed securities
Net Investment Income [Line Items]
Estimated fair value - less than 12 months	5,884,488	19,315,521
Unrealized losses - less than 12 months	$ (17,773)	$ (209,890)
Number of positions held - less than 12 months | position	8	22
Estimated fair value - 12 months or more	$ 35,096,038	$ 35,206,442
Unrealized losses - 12 months or more	$ (5,533,927)	$ (6,211,339)
Number of positions held - 12 months or more | position	36	36
Estimated fair value - total	$ 40,980,526	$ 54,521,963
Unrealized losses - total	(5,551,700)	(6,421,229)
Total fixed-maturity securities
Net Investment Income [Line Items]
Estimated fair value - less than 12 months	57,833,646	78,432,187
Unrealized losses - less than 12 months	$ (513,360)	$ (1,307,940)
Number of positions held - less than 12 months | position	68	88
Estimated fair value - 12 months or more	$ 100,156,578	$ 103,755,251
Unrealized losses - 12 months or more	$ (12,471,698)	$ (14,226,427)
Number of positions held - 12 months or more | position	111	116
Estimated fair value - total	$ 157,990,224	$ 182,187,438
Unrealized losses - total	$ (12,985,058)	$ (15,534,367)