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Note 4 - Revenue Recognition (Tables)

3 Months Ended

Apr. 30, 2021

Notes Tables

Disaggregation of Revenue [Table Text Block]

		Three Months Ended April 30,
		2021								2020
		Sales				% to Total				Sales				% to Total
Products		$	2,587				10	%		$	4,465				19	%
Specialty Piping Systems and Coating
Revenue recognized under input method			9,952				41	%			8,562				38	%
Revenue recognized under output method			11,884				49	%			9,714				43	%
Total		$	24,423				100	%		$	22,741				100	%

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

(In thousands)		April 30, 2021		January 31, 2021
Costs incurred on uncompleted contracts		$ 18,035		$ 17,543
Estimated earnings		9,825		9,651
Earned revenue		27,860		27,194
Less billings to date		26,421		23,949
Costs in excess of billings, net		$ 1,439		$ 3,245
Balance sheet classification
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts		$ 3,473		$ 4,007
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts		(2,034)		(762)
Costs in excess of billings, net		$ 1,439		$ 3,245

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