Operating leases, Quantitative Data (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020
Operating Lease Amounts [Abstract]
Right-of-use assets	$ 2,043		$ 2,043		$ 1,575
Lease liabilities	2,063		2,063		$ 1,587
Other Information [Abstract]
Operating outgoing cash flows from operating leases	86	$ 78	173	$ 155
Right-of-use assets obtained in exchange for new operating lease liabilities	625	1,840	625	1,840
Lease Costs [Abstract]
Operating lease cost	81	70	161	142
Variable lease cost	$ 10	$ 10	$ 20	$ 20