Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets [Abstract]
Fixed maturities, cost	$ 53,746	$ 62,136
Equity investments, cost	9,146	19,099
Premiums receivable, allowance for doubtful accounts	115	115
Other receivables, allowance for doubtful accounts	0	806
Service fee receivable, allowance for doubtful accounts	318	274
Property and equipment, accumulated depreciation	13,600	10,603
Amortization of intangible assets	$ 8,333	$ 7,181
Equity [Abstract]
Common stock, shares outstanding	21,708,190	21,458,190