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Note 4 - Revenue Recognition - Revenues by Revenue Class (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2022 | Oct. 31, 2021 | Oct. 31, 2022 | Oct. 31, 2021
Sales by product | $ 37,903 | $ 35,199 | $ 106,128 | $ 99,426
Sales by product, percent | 100.00% | 100.00% | 100.00% | 100.00%
Product [Member] | Transferred at Point in Time [Member] |  |  |  |
Sales by product | $ 4,363 | $ 3,340 | $ 11,144 | $ 10,475
Sales by product, percent | 12.00% | 10.00% | 10.00% | 11.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Input Method [Member] |  |  |  |
Sales by product | $ 12,593 | $ 9,166 | $ 35,918 | $ 33,118
Sales by product, percent | 33.00% | 26.00% | 34.00% | 33.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Output Method [Member] |  |  |  |
Sales by product | $ 20,947 | $ 22,693 | $ 59,066 | $ 55,833
Sales by product, percent | 55.00% | 64.00% | 56.00% | 56.00%

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