Investments, Debt Security by Contractual Maturity (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Amortized cost [Abstract]
Due in one year or less	$ 1,217,352
Due after one year through five years	31,340,053
Due after five years through ten years	37,234,486
Due after ten years	90,120,620
Original or amortized cost	159,912,511	$ 170,595,860
Estimated fair value [Abstract]
Due in one year or less	1,250,610
Due after one year through five years	41,789,869
Due after five years through ten years	38,512,732
Due after ten years	97,002,014
Estimated fair value	178,555,225	187,239,718
Amortized cost of investment in fixed maturities rated below investment grade	$ 21,108,077	$ 33,064,563