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Note 4 - Revenue Recognition (Tables)

9 Months Ended

Oct. 31, 2025

Notes Tables

Disaggregation of Revenue [Table Text Block]

		Three Months Ended October 31,																Nine Months Ended October 31,
		2025								2024								2025								2024
		Sales				% of Total				Sales				% of Total				Sales				% of Total				Sales				% of Total
Products		$	4,423				7	%		$	3,622				8	%		$	11,515				7	%		$	9,670				8	%
Specialty Piping Systems and Coating
Revenue recognized under input method			15,120				25	%			12,268				30	%			40,144				26	%			35,020				31	%
Revenue recognized under output method			41,605				68	%			25,673				62	%			104,137				67	%			68,707				61	%
Total		$	61,148				100	%		$	41,563				100	%		$	155,796				100	%		$	113,397				100	%

Schedule of Assumptions for Long-Duration Contracts by Product and Guarantee [Table Text Block]

		October 31, 2025				January 31, 2025
Costs incurred on uncompleted contracts		$	15,793			$	11,621
Estimated earnings			9,188				9,366
Earned revenue			24,981				20,987
Less billings to date			22,646				19,302
Costs in excess of billings, net		$	2,335			$	1,685
Balance sheet classification
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts		$	4,084			$	2,934
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts			(1,749	)			(1,249	)
Costs in excess of billings, net		$	2,335			$	1,685

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