Investments - Unrealized appreciation on investments (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Notes to Financial Statements
Gross unrealized appreciation of fixed maturities	$ 14,205	$ 3,188
Gross unrealized (depreciation) of fixed maturities	(2,122)	(44,624)
Net unrealized appreciation (depreciation) on investments	12,083	(41,436)
Deferred federal tax expense	(4,108)	14,088
Net unrealized appreciation (depreciation), net of deferred income taxes	$ 7,975	$ (27,348)