Note 2 - Commitments - Supplement Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating cash outflows for operating leases	$ 1,271	$ 1,163
Operating cash outflows for finance leases	4	10
Financing cash outflows for finance leases	$ 75	$ 120
Operating leases (Year)	2 years 4 months 24 days	2 years 10 months 24 days
Finance leases (Year)	2 years 10 months 24 days	1 year 10 months 24 days
Operating leases	2.30%	4.05%
Finance leases	2.65%	6.41%