Note 4 - Revenue Recognition (Tables)

3 Months Ended

Apr. 30, 2023

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended April 30,
	2023					2022
	Sales		% of Total			Sales		% of Total
Products	$	2,842		9	%	$	2,912		9	%
Specialty Piping Systems and Coating
Revenue recognized under input method		10,338		35	%		10,617		34	%
Revenue recognized under output method		16,477		56	%		17,693		57	%
Total	$	29,657		100	%	$	31,222		100	%

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

(In thousands)	April 30, 2023			January 31, 2023
Costs incurred on uncompleted contracts	$	17,909		$	18,342
Estimated earnings		9,657			9,370
Earned revenue		27,566			27,712
Less billings to date		28,041			26,329
(Billings in excess of cost)/costs in excess of billings, net	$	(475	)	$	1,383
Balance sheet classification
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts	$	2,974		$	3,126
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts		(3,449	)		(1,743	)
(Billings in excess of cost)/costs in excess of billings, net	$	(475	)	$	1,383