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Note 4 - Revenue Recognition - Revenues by Revenue Class (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Sales by product	$ 35,199	$ 20,294	$ 99,426	$ 63,399
Sales by product, percent	100.00%	100.00%	100.00%	100.00%
Product [Member] | Transferred at Point in Time [Member]
Sales by product	$ 3,340	$ 2,435	$ 10,475	$ 8,603
Sales by product, percent	10.00%	12.00%	11.00%	14.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Input Method [Member]
Sales by product	$ 9,166	$ 8,252	$ 33,118	$ 26,597
Sales by product, percent	26.00%	41.00%	33.00%	42.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Output Method [Member]
Sales by product	$ 22,693	$ 9,607	$ 55,833	$ 28,199
Sales by product, percent	64.00%	47.00%	56.00%	44.00%

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- Definition

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+ References

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