Note 3 - Commitments - Supplement Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating cash outflows for operating leases	$ 696	$ 724
Operating cash outflows for finance leases	3	8
Financing cash outflows for finance leases	$ 43	$ 76
Operating leases (Year)	2 years 4 months 24 days	2 years 2 months 12 days
Finance leases (Year)	1 year 10 months 24 days	1 year 7 months 6 days
Operating leases	2.10%	9.66%
Finance leases	5.59%	7.63%