Note 4 - Revenue Recognition (Tables)

3 Months Ended

Apr. 30, 2022

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended April 30,
	2022					2021
	Sales		% to Total			Sales		% to Total
Products		2,912		9	%	$	2,587		10	%
Specialty Piping Systems and Coating
Revenue recognized under input method		10,617		34	%		9,952		41	%
Revenue recognized under output method		17,693		57	%		11,884		49	%
Total	$	31,222		100	%	$	24,423		100	%

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

(In thousands)	April 30, 2022			January 31, 2022
Costs incurred on uncompleted contracts	$	23,326		$	20,021
Estimated earnings		13,531			12,030
Earned revenue		36,857			32,051
Less billings to date		32,026			31,019
Costs in excess of billings, net	$	4,831		$	1,032
Balance sheet classification
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts	$	6,004		$	2,309
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts		(1,173	)		(1,277	)
Costs in excess of billings, net	$	4,831		$	1,032