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Note 4 - Revenue Recognition - Revenues by Revenue Class (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2024	Apr. 30, 2023
Sales by product	$ 34,321	$ 29,657
Sales by product, percent	100.00%	100.00%
Product [Member] | Transferred at Point in Time [Member]
Sales by product	$ 3,253	$ 2,842
Sales by product, percent	9.00%	9.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Input Method [Member]
Sales by product	$ 10,140	$ 10,338
Sales by product, percent	30.00%	35.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Output Method [Member]
Sales by product	$ 20,928	$ 16,477
Sales by product, percent	61.00%	56.00%

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- Definition

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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