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Note 4 - Revenue Recognition - Revenues by Revenue Class (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Sales by product	$ 61,148	$ 41,563	$ 155,796	$ 113,397
Sales by product, percent	100.00%	100.00%	100.00%	100.00%
Product [Member] | Transferred at Point in Time [Member]
Sales by product	$ 4,423	$ 3,622	$ 11,515	$ 9,670
Sales by product, percent	7.00%	8.00%	7.00%	8.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Input Method [Member]
Sales by product	$ 15,120	$ 12,268	$ 40,144	$ 35,020
Sales by product, percent	25.00%	30.00%	26.00%	31.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Output Method [Member]
Sales by product	$ 41,605	$ 25,673	$ 104,137	$ 68,707
Sales by product, percent	68.00%	62.00%	67.00%	61.00%

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- Definition

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+ References

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