Statutory Net Income, Capital and Surplus and Dividend Restrictions - Statutory Net Income, Capital and Surplus and Dividend (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	$ 418,449,596	$ 364,518,536	$ 407,125,532
Statutory net income (loss)	44,680,696	(33,246,417)	1,677,549
Atlantic States [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	259,030,868	230,736,313	260,428,754
Statutory unassigned (deficit) surplus	155,909,822	140,713,118	172,709,955
Statutory net income (loss)	22,282,231	(23,458,516)	(2,037,672)
Southern [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	54,405,568	45,355,785	54,503,581
Statutory unassigned (deficit) surplus	(2,375,794)	(6,346,270)	2,914,532
Statutory net income (loss)	5,061,477	(9,822,457)	(3,375,434)
Peninsula [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	39,244,570	32,717,996	39,396,818
Statutory unassigned (deficit) surplus	20,936,805	14,415,949	21,148,253
Statutory net income (loss)	7,360,378	(6,316,130)	(841,119)
MICO [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	65,768,590	55,708,442	52,796,379
Statutory unassigned (deficit) surplus	38,910,008	28,949,919	26,162,540
Statutory net income (loss)	$ 9,976,610	$ 6,350,686	$ 7,931,774