Operating leases, Quantitative Data (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2023
Operating Lease Amounts [Abstract]
Right-of-use assets	$ 2,014		$ 2,014		$ 2,188
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Prepaid Expense and Other Assets		Prepaid Expense and Other Assets		Prepaid Expense and Other Assets
Lease liabilities	$ 2,105		$ 2,105		$ 2,277
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Accrued Liabilities and Other Liabilities		Accrued Liabilities and Other Liabilities		Accrued Liabilities and Other Liabilities
Other Information [Abstract]
Operating outgoing cash flows from operating leases	$ 115	$ 90	$ 228	$ 179
Right-of-use assets obtained in exchange for new operating lease liabilities	0	0	561	0
Lease Costs [Abstract]
Operating lease cost	106	82	208	163
Variable lease cost	$ 11	$ 10	$ 22	$ 20