Operating leases, Quantitative Data (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Operating Lease Amounts [Abstract]
Right-of-use assets	$ 1,701	$ 1,701
Lease liabilities	$ 1,707	1,707
Other Information [Abstract]
Operating outgoing cash flows from operating leases		155
Right-of-use assets obtained in exchange for new operating lease liabilities		$ 1,840
Weighted-average remaining lease term (Years)	7 years 7 months 13 days	7 years 7 months 13 days
Weighted-average discount rate	2.51%	2.51%
Lease Costs [Abstract]
Operating lease cost	$ 70	$ 142
Variable lease cost	$ 10	$ 20