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Note 11 - Supplementary Balance Sheet Information - Schedule of Inventory (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Raw materials and purchased parts	$ 33,319	$ 27,461
Work-in-process	5,050	7,739
Finished goods	36,587	36,120
Total inventories	74,956	71,320		$ 80,847	$ 75,150	$ 74,970
SEC Schedule, 12-09, Reserve, Inventory [Member]
Balance	6,067	4,732	$ 4,082
Provisions	5,421	4,018	1,844
Inventory disposals and adjustments	(5,620)	(2,683)	(1,194)
Balance	$ 5,868	$ 6,067	$ 4,732

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of items purchased for use as components of a finished product or pieces of machinery and equipment plus any items in their natural and unrefined state. This element may be used when the reporting entity combines raw materials and purchased parts into an aggregate amount.

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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