Note 4 - Revenue Recognition (Tables)

6 Months Ended

Jul. 31, 2024

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended July 31,										Six Months Ended July 31,
	2024					2023					2024					2023
	Sales		% of Total			Sales		% of Total			Sales		% of Total			Sales		% of Total
Products	$	2,795		7	%	$	2,146		7	%	$	6,048		8	%	$	4,988		7	%
Specialty Piping Systems and Coating
Revenue recognized under input method		12,613		34	%		12,801		36	%		22,752		32	%		23,139		36	%
Revenue recognized under output method		22,105		59	%		20,194		57	%		43,034		60	%		36,671		57	%
Total	$	37,513		100	%	$	35,141		100	%	$	71,834		100	%	$	64,798		100	%

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

	July 31, 2024			January 31, 2024
Costs incurred on uncompleted contracts	$	17,686		$	21,912
Estimated earnings		12,110			11,270
Earned revenue		29,796			33,182
Less billings to date		27,415			30,580
Costs in excess of billings, net	$	2,381		$	2,602
Balance sheet classification
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts	$	3,085		$	3,097
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts		(704	)		(495	)
Costs in excess of billings, net	$	2,381		$	2,602