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Note 4 - Revenue Recognition - Revenues by Revenue Class (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022
Sales by product	$ 45,690	$ 37,903	$ 110,489	$ 106,128
Sales by product, percent	100.00%	100.00%	100.00%	100.00%
Product [Member] | Transferred at Point in Time [Member]
Sales by product	$ 2,553	$ 4,363	$ 7,541	$ 11,144
Sales by product, percent	5.00%	12.00%	7.00%	10.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Input Method [Member]
Sales by product	$ 18,641	$ 12,593	$ 41,779	$ 35,918
Sales by product, percent	41.00%	33.00%	38.00%	34.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Output Method [Member]
Sales by product	$ 24,496	$ 20,947	$ 61,169	$ 59,066
Sales by product, percent	54.00%	55.00%	55.00%	56.00%

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- Definition

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+ References

No definition available.

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