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Note 4 - Revenue Recognition - Revenues by Revenue Class (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Net sales	$ 20,364	$ 36,667	$ 43,106	$ 60,943
Sales by product, percent	100.00%	100.00%	100.00%	100.00%
Product [Member] | Transferred at Point in Time [Member]
Net sales	$ 1,703	$ 5,860	$ 6,168	$ 10,757
Sales by product, percent	8.00%	16.00%	14.00%	18.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Input Method [Member]
Net sales	$ 9,784	$ 15,451	$ 18,346	$ 24,238
Sales by product, percent	48.00%	42.00%	43.00%	40.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Output Method [Member]
Net sales	$ 8,877	$ 15,356	$ 18,592	$ 25,948
Sales by product, percent	44.00%	42.00%	43.00%	42.00%

X

- Definition

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+ References

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- Definition

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