Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Gross premiums written	$ 31,308	$ 28,497	$ 29,725	$ 25,393	$ 25,245	$ 24,242	$ 23,059	$ 21,204
Net premiums written	27,069	24,634	26,176	22,050	21,467	28,599	15,942	13,666	$ 99,929	$ 79,674	$ 66,299
Net premiums earned	24,463	23,380	21,675	20,109	19,274	17,883	15,115	14,493	89,627	66,765	57,528
Net investment income	548	560	528	537	442	505	469	486	2,173	1,902	1,175
Net realized gains	761	71	541	(8)	47	6	87	145	1,365	285	417
Other gains (losses)	(400)	0	0	0	0	104	0	0	(400)	104	0
Other income	287	303	283	245	175	523	480	489	1,118	1,667	1,809
Losses and loss adjustment expenses, net	18,181	14,582	13,541	12,699	11,523	9,813	8,976	8,570	59,003	38,882	40,730
Policy acquisition costs	6,997	6,266	6,014	6,003	6,344	4,605	2,639	2,595	25,280	16,183	14,696
Operating expenses	4,211	4,710	4,536	4,139	4,170	3,325	3,619	3,692	17,596	14,806	12,139
Interest expense	179	168	143	157	105	181	239	244	647	769	584
Income tax (benefit) expense	530	16	(623)	0	48	(48)	48	0	(77)	48	(281)
Equity earnings (losses) in affiliates, net of tax	18	(47)	71	87	(52)	0	0	0	129	(52)	0
Net income (loss)	(4,421)	(1,475)	(513)	(2,028)	(2,304)	1,145	630	512	(8,437)	(17)	(6,939)
Net income (loss) allocable to common shareholders	$ (4,421)	$ (1,475)	$ (513)	$ (2,028)	$ (2,304)	$ 1,212	$ 366	$ 250	$ (8,437)	$ (476)	$ (7,200)
Diluted earnings (loss) per common share (in dollars per share)	$ (0.58)	$ (0.19)	$ (0.07)	$ (0.27)	$ (0.30)	$ 0.21	$ 0.09	$ 0.06
Combined ratio	118.70%	107.90%	109.70%	112.20%	113.30%	96.40%	97.70%	99.20%