Note 4 - Revenue Recognition (Tables)

9 Months Ended

Oct. 31, 2024

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended October 31,										Nine Months Ended October 31,
	2024					2023					2024					2023
	Sales		% of Total			Sales		% of Total			Sales		% of Total			Sales		% of Total
Products	$	3,622		8	%	$	2,553		5	%	$	9,670		8	%	$	7,541		7	%
Specialty Piping Systems and Coating
Revenue recognized under input method		12,268		30	%		18,641		41	%		35,020		31	%		41,779		38	%
Revenue recognized under output method		25,673		62	%		24,496		54	%		68,707		61	%		61,169		55	%
Total	$	41,563		100	%	$	45,690		100	%	$	113,397		100	%	$	110,489		100	%

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

	October 31, 2024			January 31, 2024
Costs incurred on uncompleted contracts	$	15,742		$	21,912
Estimated earnings		11,766			11,270
Earned revenue		27,508			33,182
Less billings to date		26,359			30,580
Costs in excess of billings, net	$	1,149		$	2,602
Balance sheet classification
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts	$	2,499		$	3,097
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts		(1,350	)		(495	)
Costs in excess of billings, net	$	1,149		$	2,602