Note 3 - Commitments - Supplement Information Related to Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Operating lease costs	$ 297	$ 387	$ 764	$ 724
Variable operating lease costs	4	17	21	33
Total operating lease cost	301	404	785	757
Amortization of right-of-use assets	19	40	40	80
Interest on lease liabilities	1	4	3	8
Total finance lease cost	$ 20	$ 44	$ 43	$ 88