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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Total revenue	$ 110,803	$ 135,598
Product [Member]
Total revenue	104,204	116,036
Operating Segments [Member] | Smart Water [Member]
Total revenue	35,816	32,434
Operating Segments [Member] | Smart Water [Member] | Product [Member]
Total revenue	35,816	32,434
Operating Segments [Member] | Energy Solutions [Member]
Total revenue	50,706	77,977
Operating Segments [Member] | Energy Solutions [Member] | Product [Member]
Total revenue	44,600	58,878
Operating Segments [Member] | Intelligent Industrial [Member]
Total revenue	23,960	24,891
Operating Segments [Member] | Intelligent Industrial [Member] | Product [Member]
Total revenue	$ 23,788	$ 24,724

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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