Note 6 - Leases - Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023
Amortization of right-of-use assets	$ 8	$ 7
Interest on lease liabilities	1	1
Total finance lease cost	9	8
Short-term lease cost	25	15
Total lease cost	34	23
Operating cash flows from financing leases included in lease liabilities	1	1
Financing cash flows from financing leases included in lease liabilities	$ 7	$ 7
Weighted-average remaining lease term - financing leases (years) (Year)	2 years		2 years 3 months
Weighted-average discount rate - financing leases	4.75%		4.75%