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Note 4 - Revenue Recognition - Revenues by Revenue Class (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2025 | Jul. 31, 2024 | Jul. 31, 2025 | Jul. 31, 2024
Sales by product | $ 47,902 | $ 37,513 | $ 94,648 | $ 71,834
Sales by product, percent | 100.00% | 100.00% | 100.00% | 100.00%
Product [Member] | Transferred at Point in Time [Member] |  |  |  |
Sales by product | $ 3,451 | $ 2,795 | $ 7,091 | $ 6,048
Sales by product, percent | 7.00% | 7.00% | 8.00% | 8.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Input Method [Member] |  |  |  |
Sales by product | $ 12,965 | $ 12,613 | $ 25,025 | $ 22,752
Sales by product, percent | 27.00% | 34.00% | 26.00% | 32.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Output Method [Member] |  |  |  |
Sales by product | $ 31,486 | $ 22,105 | $ 62,532 | $ 43,034
Sales by product, percent | 66.00% | 59.00% | 66.00% | 60.00%

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