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Note 4 - Revenue Recognition (Tables)

6 Months Ended

Jul. 31, 2021

Notes Tables

Disaggregation of Revenue [Table Text Block]

		Three Months Ended July 31,																Six Months Ended July 31,
		2021								2020								2021								2020
		Sales				% to Total				Sales				% to Total				Sales				% to Total				Sales				% to Total
Products		$	4,548				11	%		$	1,703				8	%		$	7,135				11	%		$	6,168				14	%
Specialty Piping Systems and Coating
Revenue recognized under input method			13,999				35	%			9,784				48	%			23,952				37	%			18,346				43	%
Revenue recognized under output method			21,257				54	%			8,877				44	%			33,140				52	%			18,592				43	%
Total		$	39,804				100	%		$	20,364				100	%		$	64,227				100	%		$	43,106				100	%

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

(In thousands)		July 31, 2021		January 31, 2021
Costs incurred on uncompleted contracts		$ 20,705		$ 17,543
Estimated earnings		10,986		9,651
Earned revenue		31,691		27,194
Less billings to date		31,759		23,949
Costs in excess of billings, net		$ (68)		$ 3,245
Balance sheet classification
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts		$ 1,713		$ 4,007
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts		(1,781)		(762)
Costs in excess of billings, net		$ (68)		$ 3,245

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