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Note 21 - Segment and Geographic Information (Tables)

12 Months Ended

Sep. 30, 2025

Notes Tables

Schedule of Segment Reporting Information, by Segment [Table Text Block]

		YEAR ENDED SEPTEMBER 30,
		2025				2024
Revenue:
Smart Water		$	35,816			$	32,434
Energy Solutions			50,706				77,977
Intelligent Industrial			23,960				24,891
Corporate			321				296
		110,803				135,598
Cost of revenue:
Smart Water			21,106				16,653
Energy Solutions			36,580				46,922
Intelligent Industrial			20,082				19,335
Corporate			138				115
		77,906				83,025
Gross profit:
Smart Water			14,710				15,781
Energy Solutions			14,126				31,055
Intelligent Industrial			3,878				5,556
Corporate			183				181
		32,897				52,573
Operating expenses:
Smart Water			9,047				6,566
Energy Solutions			13,738				12,485
Intelligent Industrial			8,207				12,247
Corporate			17,805				14,158
		48,797				45,456
Gain on disposal of property:
Corporate			4,616				—
Income (loss) from operations:
Smart Water			5,663				9,215
Energy Solutions			388				18,570
Intelligent Industrial			(4,329	)			(6,691	)
Corporate			(13,006	)			(13,977	)
		(11,284		)		7,117
Other segment disclosures:
Interest income:
Smart Water			—				315
Energy Solutions			1,694				—
Intelligent Industrial			—				—
Corporate			843				1,243
		2,537				1,558
Interest expense:
Smart Water			—				17
Energy Solutions			23				—
Corporate			146				170
		169				187
Depreciation and amortization expenses:
Smart Water			1,145				482
Energy Solutions			7,333				13,243
Intelligent Industrial			1,049				653
Corporate			619				388
		10,146				14,766
Impairment, inventory obsolescence and stock-based compensation expenses:
Smart Water			31				189
Energy Solutions			2,618				993
Intelligent Industrial			907				2,830
Corporate			1,020				642
		4,576				4,654

Schedule of Revenue Generated by the Company's Subsidiaries [Table Text Block]

		YEAR ENDED SEPTEMBER 30,
		2025				2024
United States		$	106,603			$	127,488
Canada			1,552				1,777
Russian Federation			—				3,487
United Kingdom			2,648				2,846
		$	110,803			$	135,598

Reconciliation of Revenue from Segments to Consolidated [Table Text Block]

		YEAR ENDED SEPTEMBER 30,
		2025				2024
Asia (including Russian Federation)		$	26,552			$	51,103
Canada			2,931				2,015
Europe			5,067				13,817
Mexico			2,746				1,959
South America			3,146				2,798
United States			69,291				63,061
Other			1,070				845
		$	110,803			$	135,598

Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]

		AS OF SEPTEMBER 30,
		2025				2024
United States		$	63,332			$	61,487
Canada			366				414
Colombia			392				399
United Kingdom			447				528
		$	64,537			$	62,828

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