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Note 4 - Revenue Recognition (Tables)

6 Months Ended

Jul. 31, 2023

Notes Tables

Disaggregation of Revenue [Table Text Block]

		Three Months Ended July 31,																Six Months Ended July 31,
		2023								2022								2023								2022
		Sales				% of Total				Sales				% of Total				Sales				% of Total				Sales				% of Total
Products		$	2,146				7	%		$	3,869				11	%		$	4,988				7	%		$	6,780				10	%
Specialty Piping Systems and Coating
Revenue recognized under input method			12,801				36	%			12,707				34	%			23,139				36	%			23,325				34	%
Revenue recognized under output method			20,194				57	%			20,427				55	%			36,671				57	%			38,120				56	%
Total		$	35,141				100	%		$	37,003				100	%		$	64,798				100	%		$	68,225				100	%

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

(In thousands)		July 31, 2023				January 31, 2023
Costs incurred on uncompleted contracts		$	21,871			$	18,342
Estimated earnings			12,366				9,370
Earned revenue			34,237				27,712
Less billings to date			35,349				26,329
(Billings in excess of costs) costs in excess of billings, net		$	(1,112	)		$	1,383
Balance sheet classification
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts		$	1,856			$	3,126
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts			(2,968	)			(1,743	)
(Billings in excess of costs) costs in excess of billings, net		$	(1,112	)		$	1,383

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