Note 2 - Revenue Recognition - Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Total revenue	$ 24,843	$ 25,858	$ 80,089	$ 100,160
Product [Member]
Total revenue	23,227	20,223	74,580	83,434
Asia [Member] | Product [Member]
Total revenue	1,684	3,430	21,552	39,318
CANADA | Product [Member]
Total revenue	1,022	178	2,017	2,406
Europe [Member] | Product [Member]
Total revenue	1,723	1,137	4,311	4,022
MEXICO | Product [Member]
Total revenue	240	601	2,332	971
UNITED STATES | Product [Member]
Total revenue	18,343	14,436	43,768	35,685
Other [Member] | Product [Member]
Total revenue	$ 215	$ 441	$ 600	$ 1,032