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Note 4 - Revenue Recognition - Revenues by Revenue Class (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2025	Apr. 30, 2024
Sales by product	$ 46,747	$ 34,321
Sales by product, percent	100.00%	100.00%
Product [Member] | Transferred at Point in Time [Member]
Sales by product	$ 3,640	$ 3,253
Sales by product, percent	8.00%	9.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Input Method [Member]
Sales by product	$ 12,060	$ 10,140
Sales by product, percent	26.00%	30.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Output Method [Member]
Sales by product	$ 31,047	$ 20,928
Sales by product, percent	66.00%	61.00%

X

- Definition

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

+ References

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- Definition

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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