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Note 4 - Revenue Recognition - Revenues by Revenue Class (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2024 | Jul. 31, 2023 | Jul. 31, 2024 | Jul. 31, 2023
Sales by product | $ 37,513 | $ 35,141 | $ 71,834 | $ 64,798
Sales by product, percent | 100.00% | 100.00% | 100.00% | 100.00%
Product [Member] | Transferred at Point in Time [Member] |  |  |  |
Sales by product | $ 2,795 | $ 2,146 | $ 6,048 | $ 4,988
Sales by product, percent | 7.00% | 7.00% | 8.00% | 7.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Input Method [Member] |  |  |  |
Sales by product | $ 12,613 | $ 12,801 | $ 22,752 | $ 23,139
Sales by product, percent | 34.00% | 36.00% | 32.00% | 36.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Output Method [Member] |  |  |  |
Sales by product | $ 22,105 | $ 20,194 | $ 43,034 | $ 36,671
Sales by product, percent | 59.00% | 57.00% | 60.00% | 57.00%

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