Operating leases, Quantitative Data (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)
Operating Lease Amounts [Abstract]
Right-of-use assets	$ 1,638	$ 1,638
Lease liabilities	$ 1,647	1,647
Other Information [Abstract]
Operating outgoing cash flows from operating leases		226
Right-of-use assets obtained in exchange for new operating lease liabilities		$ 1,840
Weighted-average remaining lease term	7 years 5 months 5 days	7 years 5 months 5 days
Weighted-average discount rate	2.52%	2.52%
Lease Costs [Abstract]
Operating lease cost	$ 63	$ 205
Variable lease cost	$ 10	$ 30