Statutory Net Income, Capital and Surplus and Dividend Restrictions - Statutory Net Income, Capital and Surplus and Dividend (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	$ 364,518,536	$ 407,125,532	$ 421,752,063
Statutory net (loss) income	(33,246,417)	1,677,549	26,926,349
Atlantic States [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	194,386,473	223,170,835	227,907,377
Statutory unassigned (deficit) surplus	131,803,666	161,760,924	167,872,138
Statutory net (loss) income	(22,039,704)	(312,221)	15,750,876
Southern [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	45,355,785	54,503,581	63,331,001
Statutory unassigned (deficit) surplus	(6,346,270)	2,914,532	11,881,309
Statutory net (loss) income	(9,822,457)	(3,375,434)	1,774,299
Le Mars [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	19,593,938	23,434,801	25,543,803
Statutory unassigned (deficit) surplus	6,462,783	10,394,533	12,614,756
Statutory net (loss) income	(3,281,643)	(1,679,335)	603,226
Peninsula [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	32,717,996	39,396,818	41,977,034
Statutory unassigned (deficit) surplus	14,415,949	21,148,253	23,826,681
Statutory net (loss) income	(6,316,130)	(841,119)	966,391
Sheboygan [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	16,755,902	13,823,118	13,129,143
Statutory unassigned (deficit) surplus	2,446,669	554,498	914,773
Statutory net (loss) income	1,862,831	(46,116)	644,344
MICO [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	55,708,442	52,796,379	49,863,705
Statutory unassigned (deficit) surplus	28,949,919	26,162,540	23,380,942
Statutory net (loss) income	$ 6,350,686	$ 7,931,774	$ 7,187,213