Note 8 - Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Right-of-use operating lease costs	$ 68	$ 68	$ 204	$ 204
Short-term lease costs	36	52	168	148
Total	$ 104	$ 120	$ 372	$ 352