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Note 4 - Revenue Recognition - Revenues by Revenue Class (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2021 | Jul. 31, 2020
Sales by product | $ 39,804 | $ 20,364 | $ 64,227 | $ 43,106
Sales by product, percent | 100.00% | 100.00% | 100.00% | 100.00%
Product [Member] | Transferred at Point in Time [Member] |  |  |  |
Sales by product | $ 4,548 | $ 1,703 | $ 7,135 | $ 6,168
Sales by product, percent | 11.00% | 8.00% | 11.00% | 14.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Input Method [Member] |  |  |  |
Sales by product | $ 13,999 | $ 9,784 | $ 23,952 | $ 18,346
Sales by product, percent | 35.00% | 48.00% | 37.00% | 43.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Output Method [Member] |  |  |  |
Sales by product | $ 21,257 | $ 8,877 | $ 33,140 | $ 18,592
Sales by product, percent | 54.00% | 44.00% | 52.00% | 43.00%

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