Investments - Available for sale investments (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Certificates of deposit
Amortized cost of fixed maturity investments by asset type	$ 63,519,000	$ 58,127,000
Gross unrealized gains by asset type	0	0
Gross unrealized losses by asset type	0	0
Investments at fair value	63,519,000	58,127,000
U.S. treasury securities
Amortized cost of fixed maturity investments by asset type	19,088,624	24,075,727
Gross unrealized gains by asset type	41,257	3,188
Gross unrealized losses by asset type	(79)	(44,624)
Investments at fair value	19,129,802	24,034,291
Total fixed maturities
Amortized cost of fixed maturity investments by asset type	82,607,624	82,202,727
Gross unrealized gains by asset type	41,257	3,188
Gross unrealized losses by asset type	(79)	(44,624)
Investments at fair value	$ 82,648,802	$ 82,161,291