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Note 4 - Revenue Recognition - Revenues by Revenue Class (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2023	Jul. 31, 2022
Sales by product	$ 35,141	$ 37,003	$ 64,798	$ 68,225
Sales by product, percent	100.00%	100.00%	100.00%	100.00%
Product [Member] | Transferred at Point in Time [Member]
Sales by product	$ 2,146	$ 3,869	$ 4,988	$ 6,780
Sales by product, percent	7.00%	11.00%	7.00%	10.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Input Method [Member]
Sales by product	$ 12,801	$ 12,707	$ 23,139	$ 23,325
Sales by product, percent	36.00%	34.00%	36.00%	34.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Output Method [Member]
Sales by product	$ 20,194	$ 20,427	$ 36,671	$ 38,120
Sales by product, percent	57.00%	55.00%	57.00%	56.00%

X

- Definition

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+ References

No definition available.

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- Definition

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