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Note 2 - Revenue Recognition - Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Total revenue	$ 18,023	$ 24,270	$ 55,246	$ 74,302
Product [Member]
Total revenue	18,708	19,497	51,353	63,211
Asia [Member] | Product [Member]
Total revenue	1,811	3,672	19,868	35,888
CANADA | Product [Member]
Total revenue	626	1,002	995	2,228
Europe [Member] | Product [Member]
Total revenue	1,190	1,507	2,588	2,885
MEXICO | Product [Member]
Total revenue	811	204	2,092	370
UNITED STATES | Product [Member]
Total revenue	14,002	12,831	25,425	21,249
Other [Member] | Product [Member]
Total revenue	$ 268	$ 281	$ 385	$ 591

X

- Definition

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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