Investments (Details 2) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Less Than 12 Months, fair Value	$ 22,926
Less Than 12 Months, Unrealized Losses	(196)
Greater than 12 Months, Fair Value	2,995
Greater than 12 Months, Unrealized Losses	(65)
Total Fair Value	25,921
Total Unrealized Losses	(261)
Fixed Income Securities [Member]
Less Than 12 Months, fair Value	22,648	$ 18,344
Less Than 12 Months, Unrealized Losses	(137)	(271)
Greater than 12 Months, Fair Value	2,995	460
Greater than 12 Months, Unrealized Losses	(65)	(3)
Total Fair Value	25,643	18,804
Total Unrealized Losses	(202)	(274)
Fixed Income Securities [Member] | U.S. government [Member]
Less Than 12 Months, fair Value	2,041	1,303
Less Than 12 Months, Unrealized Losses	(18)	(20)
Greater than 12 Months, Fair Value	175
Total Fair Value	2,216	1,303
Total Unrealized Losses	(18)	(20)
Fixed Income Securities [Member] | States, Municipalities and Political Subdivisions [Member]
Less Than 12 Months, fair Value	2,357	1,537
Less Than 12 Months, Unrealized Losses	(13)	(27)
Greater than 12 Months, Fair Value	589
Greater than 12 Months, Unrealized Losses	(13)
Total Fair Value	2,946	1,537
Total Unrealized Losses	(26)	(27)
Fixed Income Securities [Member] | Asset-backed Securities and Collateralized Mortgage Backed Obligations [Member]
Less Than 12 Months, fair Value	11,682	9,552
Less Than 12 Months, Unrealized Losses	(83)	(133)
Greater than 12 Months, Fair Value	1,675	460
Greater than 12 Months, Unrealized Losses	(36)	(3)
Total Fair Value	13,357	10,012
Total Unrealized Losses	(119)	(136)
Fixed Income Securities [Member] | Corporate [Member]
Less Than 12 Months, fair Value	6,568	5,952
Less Than 12 Months, Unrealized Losses	(23)	(91)
Greater than 12 Months, Fair Value	556
Greater than 12 Months, Unrealized Losses	(16)
Total Fair Value	7,124	5,952
Total Unrealized Losses	(39)	$ (91)
Equity Securities [Member]
Less Than 12 Months, fair Value	278
Less Than 12 Months, Unrealized Losses	(59)
Total Fair Value	278
Total Unrealized Losses	(59)
Equity Securities [Member] | Common Stock [Member]
Less Than 12 Months, fair Value	237
Less Than 12 Months, Unrealized Losses	(25)
Total Fair Value	237
Total Unrealized Losses	(25)
Equity Securities [Member] | Warrants to Purchase Common Stock [Member]
Less Than 12 Months, fair Value	23
Less Than 12 Months, Unrealized Losses	(29)
Total Fair Value	23
Total Unrealized Losses	(29)
Equity Securities [Member] | Rights to Purchase Common Stock [Member]
Less Than 12 Months, fair Value	18
Less Than 12 Months, Unrealized Losses	(5)
Total Fair Value	18
Total Unrealized Losses	$ (5)