Note 4 - Revenue Recognition (Tables)

9 Months Ended

Oct. 31, 2022

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended October 31,										Nine Months Ended October 31,
	2022					2021					2022					2021
	Sales		% to Total			Sales		% to Total			Sales		% to Total			Sales		% to Total
Products	$	4,363		12	%	$	3,340		10	%	$	11,144		10	%	$	10,475		11	%
Specialty Piping Systems and Coating
Revenue recognized under input method		12,593		33	%		9,166		26	%		35,918		34	%		33,118		33	%
Revenue recognized under output method		20,947		55	%		22,693		64	%		59,066		56	%		55,833		56	%
Total	$	37,903		100	%	$	35,199		100	%	$	106,128		100	%	$	99,426		100	%

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

(In thousands)	October 31, 2022			January 31, 2022
Costs incurred on uncompleted contracts	$	17,901		$	20,021
Estimated earnings		9,209			12,030
Earned revenue		27,110			32,051
Less billings to date		22,991			31,019
Costs in excess of billings, net	$	4,119		$	1,032
Balance sheet classification
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts	$	5,381		$	2,309
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts		(1,262	)		(1,277	)
Costs in excess of billings, net	$	4,119		$	1,032