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Note 4 - Revenue Recognition - Revenues by Revenue Class (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Sales by product	$ 24,423	$ 22,741
Sales by product, percent	100.00%	100.00%
Product [Member] | Transferred at Point in Time [Member]
Sales by product	$ 2,587	$ 4,465
Sales by product, percent	10.00%	19.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Input Method [Member]
Sales by product	$ 9,952	$ 8,562
Sales by product, percent	41.00%	38.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Output Method [Member]
Sales by product	$ 11,884	$ 9,714
Sales by product, percent	49.00%	43.00%

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- Definition

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+ References

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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