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Note 4 - Revenue Recognition - Revenues by Revenue Class (Details) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 30, 2025 | Apr. 30, 2024
Sales by product | $ 46,747 | $ 34,321
Sales by product, percent | 100.00% | 100.00%
Product [Member] | Transferred at Point in Time [Member] |  |
Sales by product | $ 3,640 | $ 3,253
Sales by product, percent | 8.00% | 9.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Input Method [Member] |  |
Sales by product | $ 12,060 | $ 10,140
Sales by product, percent | 26.00% | 30.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Output Method [Member] |  |
Sales by product | $ 31,047 | $ 20,928
Sales by product, percent | 66.00% | 61.00%

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