Operating leases - Operating leases, Quantitative Data (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Jun. 30, 2024
Operating Lease Amounts [Abstract]
Right-of-use assets	$ 1,972		$ 1,972		$ 2,071
Lease liabilities	2,057		2,057		$ 2,159
Operating outgoing cash flows from operating leases	125	$ 115	250	$ 228
Right-of-use assets obtained in exchange for new operating lease liabilities			117	561
Operating lease cost	114	106	227	208
Variable lease cost	$ 11	$ 11	$ 22	$ 22