Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Fixed maturity securities, available-for-sale, at amortized cost	$ 1,338,131	$ 1,199,409
Equity securities, at cost	$ 78,906	$ 77,152
Common stock, par value (in dollars per share)	$ 0.0002	$ 0.0002
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	30,401,270	29,988,460
Common stock, shares outstanding (in shares)	30,401,270	29,988,460
Preferred stock, par value (in dollars per share)	$ 0.00125	$ 0.00125
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0