Note 6 - Leases - Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023	Jun. 30, 2023
Amortization of right-of-use assets	$ 7	$ 7	$ 23	$ 22
Interest on lease liabilities	1	1	2	3
Total finance lease cost	8	8	25	25
Short-term lease cost	26	25	76	64
Total lease cost	34	33	101	89
Operating cash flows from financing leases included in lease liabilities	1	1	2	3
Financing cash flows from financing leases included in lease liabilities	$ 7	$ 7	$ 22	$ 20
Weighted-average remaining lease term - financing leases (years) (Year)	1 year 6 months		1 year 6 months		2 years 3 months
Weighted-average discount rate - financing leases	4.75%		4.75%		4.75%