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Note 4 - Revenue Recognition - Revenues by Revenue Class (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Apr. 30, 2024 | Apr. 30, 2023
Sales by product | $ 34,321 | $ 29,657
Sales by product, percent | 100.00% | 100.00%
Product [Member] | Transferred at Point in Time [Member] |  |
Sales by product | $ 3,253 | $ 2,842
Sales by product, percent | 9.00% | 9.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Input Method [Member] |  |
Sales by product | $ 10,140 | $ 10,338
Sales by product, percent | 30.00% | 35.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Output Method [Member] |  |
Sales by product | $ 20,928 | $ 16,477
Sales by product, percent | 61.00% | 56.00%

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