Investments (Available for sale equity investments) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Jun. 30, 2021
Marketable Securities [Abstract]
Amortized cost, equity investments	$ 54,761	$ 53,728
Estimated market value, equity investments	71,787	72,307
Common stocks [Member]
Marketable Securities [Abstract]
Amortized cost, equity investments	28,707	27,674
Estimated market value, equity investments	45,837	46,212
Non-redeemable preferred stocks [Member]
Marketable Securities [Abstract]
Amortized cost, equity investments	26,054	26,054
Estimated market value, equity investments	$ 25,950	$ 26,095