Note 5 - Leases - Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Jun. 30, 2022
Statement [Line Items]
Amortization of right-of-use assets	$ 7	$ 0	$ 22	$ 0
Interest on lease liabilities	1	0	3	0
Total finance lease cost	8	0	25	0
Operating lease cost	0	13	0	40
Short-term lease cost	25	28	64	90
Total lease cost	33	41	89	130
Operating cash flows from operating leases included in lease liabilities	0	13	0	40
Lease liabilities obtained from new ROU assets - operating	0	0	0	0
Operating cash flows from financing leases included in lease liabilities	1	0	3	0
Financing cash flows from financing leases included in lease liabilities	7	0	20	(0)
Lease liabilities obtained from new ROU assets - financing	$ 0	$ 0	$ 0	$ 0
Weighted-average discount rate - operating leases	0.00%		0.00%		0.00%
Weighted-average remaining lease term - financing leases (years) (Year)	2 years 6 months		2 years 6 months		3 years 3 months
Weighted-average discount rate - financing leases	4.75%		4.75%		4.75%