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Note 4 - Revenue Recognition (Tables)

9 Months Ended

Oct. 31, 2021

Notes Tables

Disaggregation of Revenue [Table Text Block]

		Three Months Ended October 31,																Nine Months Ended October 31,
		2021								2020								2021								2020
		Sales				% to Total				Sales				% to Total				Sales				% to Total				Sales				% to Total
Products			3,340				10	%		$	2,435				12	%			10,475				11	%		$	8,603				14	%
Specialty Piping Systems and Coating
Revenue recognized under input method			9,166				26	%			8,252				41	%			33,118				33	%			26,597				42	%
Revenue recognized under output method			22,693				64	%			9,607				47	%			55,833				56	%			28,199				44	%
Total		$	35,199				100	%		$	20,294				100	%		$	99,426				100	%		$	63,399				100	%

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

(In thousands)		October 31, 2021				January 31, 2021
Costs incurred on uncompleted contracts		$	19,077			$	17,543
Estimated earnings			11,359				9,651
Earned revenue			30,436				27,194
Less billings to date			28,985				23,949
Costs in excess of billings, net		$	1,451			$	3,245
Balance sheet classification
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts		$	2,322			$	4,007
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts			(871	)			(762	)
Costs in excess of billings, net		$	1,451			$	3,245

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