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Note 2 - Revenue Recognition - Disaggregation of Revenue (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
Operating Segments [Member] | Smart Water [Member]
Total revenue	9,472	6,411	16,760	10,645
Operating Segments [Member] | Smart Water [Member] | Product [Member]
Total revenue	9,472	6,411	16,760	10,645
Operating Segments [Member] | Energy Solutions [Member]
Total revenue	2,588	11,035	26,870	50,946
Operating Segments [Member] | Energy Solutions [Member] | Product [Member]
Total revenue	3,399	6,380	23,225	40,086
Operating Segments [Member] | Intelligent Industrial [Member]
Total revenue	5,883	6,749	11,460	12,562
Operating Segments [Member] | Intelligent Industrial [Member] | Product [Member]
Total revenue	$ 5,837	$ 6,706	$ 11,368	$ 12,480

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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