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Note 4 - Revenue Recognition (Tables)

3 Months Ended

Apr. 30, 2025

Notes Tables

Disaggregation of Revenue [Table Text Block]

		Three Months Ended April 30,
		2025								2024
		Sales				% of Total				Sales				% of Total
Products		$	3,640				8	%		$	3,253				9	%
Specialty Piping Systems and Coating
Revenue recognized under input method			12,060				26	%			10,140				30	%
Revenue recognized under output method			31,047				66	%			20,928				61	%
Total		$	46,747				100	%		$	34,321				100	%

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

		April 30, 2025				January 31, 2025
Costs incurred on uncompleted contracts		$	13,859			$	11,621
Estimated earnings			9,984				9,366
Earned revenue			23,843				20,987
Less billings to date			21,362				19,302
Costs in excess of billings, net		$	2,481			$	1,685
Balance sheet classification
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts		$	3,472			$	2,934
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts			(991	)			(1,249	)
Costs in excess of billings, net		$	2,481			$	1,685

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