Fair Vaule of Financial Instruments - Fair Value of Invested Assets (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
U.S. treasury securities	$ 23,538,002	$ 74,886,624
Certificates of deposit	10,090,000	16,470,000
Total fixed maturities	33,628,002	91,356,624
Cash and short-term investments	86,416,755	38,606,556
Total financial instruments	120,044,757	129,963,180
Level 1
U.S. treasury securities	23,538,002	74,886,624
Certificates of deposit	0	0
Total fixed maturities	23,538,002	74,886,624
Cash and short-term investments	86,416,755	38,606,556
Total financial instruments	109,954,757	113,493,180
Level 2
U.S. treasury securities	0	0
Certificates of deposit	10,090,000	16,470,000
Total fixed maturities	10,090,000	16,470,000
Cash and short-term investments	0	0
Total financial instruments	10,090,000	16,470,000
Level 3
U.S. treasury securities	0	0
Certificates of deposit	0	0
Total fixed maturities	0	0
Cash and short-term investments	0	0
Total financial instruments	$ 0	$ 0