Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Fixed maturity securities, available-for-sale, at amortized cost	$ 1,724,561	$ 1,398,533
Equity securities, at cost	$ 79,300	$ 73,244
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)	30,610,153	30,424,391
Common stock, shares outstanding (in shares)	30,610,153	30,424,391
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