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Note 4 - Revenue Recognition - Revenues by Revenue Class (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024
Sales by product	$ 158,384	$ 150,668
Sales by product, percent	100.00%	100.00%
Product [Member] | Transferred at Point in Time [Member]
Sales by product	$ 12,801	$ 10,368
Sales by product, percent	8.00%	7.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Input Method [Member]
Sales by product	$ 45,606	$ 51,977
Sales by product, percent	29.00%	34.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Output Method [Member]
Sales by product	$ 99,977	$ 88,323
Sales by product, percent	63.00%	59.00%

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- Definition

Represents the percentage of revenue from contracts with customers that is attributable to a specified product or service.

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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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