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Note 4 - Revenue Recognition - Revenues by Revenue Class (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2024 | Oct. 31, 2023 | Oct. 31, 2024 | Oct. 31, 2023
Sales by product | $ 41,563 | $ 45,690 | $ 113,397 | $ 110,489
Sales by product, percent | 100.00% | 100.00% | 100.00% | 100.00%
Product [Member] | Transferred at Point in Time [Member] |  |  |  |
Sales by product | $ 3,622 | $ 2,553 | $ 9,670 | $ 7,541
Sales by product, percent | 8.00% | 5.00% | 8.00% | 7.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Input Method [Member] |  |  |  |
Sales by product | $ 12,268 | $ 18,641 | $ 35,020 | $ 41,779
Sales by product, percent | 30.00% | 41.00% | 31.00% | 38.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Output Method [Member] |  |  |  |
Sales by product | $ 25,673 | $ 24,496 | $ 68,707 | $ 61,169
Sales by product, percent | 62.00% | 54.00% | 61.00% | 55.00%

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