Investments - Available for sale investments (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Certificates of deposit
Amortized cost of fixed maturity investments by asset type	$ 39,095,000	$ 15,089,000
Gross unrealized gains by asset type	0	0
Gross unrealized losses by asset type	0	0
Investments at fair value	39,095,000	15,089,000
U.S. treasury securities
Amortized cost of fixed maturity investments by asset type	29,070,981	20,064,111
Gross unrealized gains by asset type	92,496	14,476
Gross unrealized losses by asset type	(321)	(9,031)
Investments at fair value	29,163,156	20,069,556
Total fixed maturities
Amortized cost of fixed maturity investments by asset type	68,165,981	35,153,111
Gross unrealized gains by asset type	92,496	14,476
Gross unrealized losses by asset type	(321)	(9,031)
Investments at fair value	$ 68,258,156	$ 35,158,556