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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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