Investments - Fixed-maturity securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019
Investments
Fixed maturity securities Due after one year through three years Amortized Cost	$ 20,391
Fixed maturity securities Due after five years through 10 years Amortized Cost	7,933
Fixed maturity securities Total fixed maturity securities Amortized Cost	28,324	$ 25,761
Fixed maturity securities Due after one year through three years Fair Value	15,473
Fixed maturity securities Due after five years through 10 years Fair Value	7,312
Fixed maturity securities Total fixed maturity securities Fair Value	$ 22,785	$ 20,393