Operating leases - Operating leases, Quantitative Data (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Jun. 30, 2024
Operating Lease Amounts [Abstract]
Right-of-use assets	$ 1,863		$ 1,863		$ 2,071
Lease liabilities	1,946		1,946		$ 2,159
Operating outgoing cash flows from operating leases	126	$ 118	376	$ 346
Right-of-use assets obtained in exchange for new operating lease liabilities	0	251	117	251
Operating lease cost	113	105	340	313
Variable lease cost	$ 11	$ 11	$ 33	$ 33