Note 6 - Leases - Lease Expense (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
Amortization of right-of-use assets	$ 8	$ 7	$ 15	$ 14
Interest on lease liabilities	0	1	1	2
Total finance lease cost	8	8	16	16
Short-term lease cost	25	25	50	40
Total lease cost	33	33	66	56
Operating cash flows from financing leases included in lease liabilities	0	1	1	2
Financing cash flows from financing leases included in lease liabilities	$ 8	$ 8	$ 15	$ 13
Weighted-average remaining lease term - financing leases (years) (Year)	1 year 9 months		1 year 9 months		2 years 3 months
Weighted-average discount rate - financing leases	4.75%		4.75%		4.75%