Note 2 - Revenue Recognition - Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Total revenue	$ 15,804	$ 24,843	$ 61,132	$ 80,089
Product [Member]
Total revenue	15,218	23,227	58,571	74,580
Asia [Member] \| Product [Member]
Total revenue	3,185	1,684	5,699	21,552
CANADA \| Product [Member]
Total revenue	417	1,022	2,323	2,017
Europe [Member] \| Product [Member]
Total revenue	828	1,723	2,531	4,311
MEXICO \| Product [Member]
Total revenue	368	240	476	2,332
UNITED STATES \| Product [Member]
Total revenue	8,636	18,343	41,459	43,768
South America [Member] \| Product [Member]
Total revenue	1,428	27	5,247	232
Other [Member] \| Product [Member]
Total revenue	$ 356	$ 188	$ 836	$ 368

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details