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Note 4 - Revenue Recognition (Tables)

9 Months Ended

Oct. 31, 2023

Notes Tables

Disaggregation of Revenue [Table Text Block]

		Three Months Ended October 31,																Nine Months Ended October 31,
		2023								2022								2023								2022
		Sales				% of Total				Sales				% of Total				Sales				% of Total				Sales				% of Total
Products		$	2,553				5	%		$	4,363				12	%		$	7,541				7	%		$	11,144				10	%
Specialty Piping Systems and Coating
Revenue recognized under input method			18,641				41	%			12,593				33	%			41,779				38	%			35,918				34	%
Revenue recognized under output method			24,496				54	%			20,947				55	%			61,169				55	%			59,066				56	%
Total		$	45,690				100	%		$	37,903				100	%		$	110,489				100	%		$	106,128				100	%

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

		October 31, 2023				January 31, 2023
Costs incurred on uncompleted contracts		$	22,560			$	18,342
Estimated earnings			11,916				9,370
Earned revenue			34,476				27,712
Less billings to date			32,918				26,329
Costs in excess of billings, net		$	1,558			$	1,383
Balance sheet classification
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts		$	2,462			$	3,126
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts			(904	)			(1,743	)
Costs in excess of billings, net		$	1,558			$	1,383

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