Note 4 - Revenue Recognition (Tables)

6 Months Ended

Jul. 31, 2022

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended July 31,										Six Months Ended July 31,
	2022					2021					2022					2021
	Sales		% to Total			Sales		% to Total			Sales		% to Total			Sales		% to Total
Products		3,868		11	%	$	4,548		11	%		6,780		10	%	$	7,135		11	%
Specialty Piping Systems and Coating
Revenue recognized under input method		12,707		34	%		13,999		35	%		23,325		34	%		23,952		37	%
Revenue recognized under output method		20,428		55	%		21,257		54	%		38,120		56	%		33,140		52	%
Total	$	37,003		100	%	$	39,804		100	%	$	68,225		100	%	$	64,227		100	%

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

(In thousands)	July 31, 2022			January 31, 2022
Costs incurred on uncompleted contracts	$	21,054		$	20,021
Estimated earnings		11,422			12,030
Earned revenue		32,476			32,051
Less billings to date		27,997			31,019
Costs in excess of billings, net	$	4,479		$	1,032
Balance sheet classification
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts	$	5,946		$	2,309
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts		(1,467	)		(1,277	)
Costs in excess of billings, net	$	4,479		$	1,032