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Note 4 - Revenue Recognition - Revenues by Revenue Class (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Sales by product	$ 22,741	$ 24,276
Sales by product, percent	100.00%	100.00%
Product [Member] | Transferred at Point in Time [Member]
Sales by product	$ 4,465	$ 4,898
Sales by product, percent	19.00%	20.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Input Method [Member]
Sales by product	$ 8,562	$ 8,786
Sales by product, percent	38.00%	36.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Output Method [Member]
Sales by product	$ 9,714	$ 10,592
Sales by product, percent	43.00%	44.00%

X

- Definition

Represents the percentage of revenue from contracts with customers that is attributable to a specified product or service.

+ References

No definition available.

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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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