Investments - Available for sale investments (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Certificates of deposit
Amortized cost of fixed maturity investments by asset type	$ 54,142,000	$ 61,280,000
Gross unrealized gains by asset type	0	0
Gross unrealized losses by asset type	0	0
Investments at fair value	54,142,000	61,280,000
U.S. treasury securities
Amortized cost of fixed maturity investments by asset type	14,094,670	19,091,842
Gross unrealized gains by asset type	5,279	14,205
Gross unrealized losses by asset type	(1,524)	(2,122)
Investments at fair value	14,098,425	19,103,925
Total fixed maturities
Amortized cost of fixed maturity investments by asset type	68,236,670	80,371,842
Gross unrealized gains by asset type	5,279	14,205
Gross unrealized losses by asset type	(1,524)	(2,122)
Investments at fair value	$ 68,240,425	$ 80,383,925