Note 8 - Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Right-of-use operating lease costs	$ 68	$ 68	$ 136	$ 136
Short-term lease costs	90	52	132	96
Total	$ 158	$ 120	$ 268	$ 232