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Note 4 - Revenue Recognition - Revenues by Revenue Class (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jan. 31, 2021 | Jan. 31, 2020
Sales by product | $ 84,694 | $ 127,663
Sales by product, percent | 100.00% | 100.00%
Product [Member] | Transferred at Point in Time [Member] |  |
Sales by product | $ 11,496 | $ 15,991
Sales by product, percent | 14.00% | 12.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Input Method [Member] |  |
Sales by product | $ 35,041 | $ 48,415
Sales by product, percent | 41.00% | 38.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Output Method [Member] |  |
Sales by product | $ 38,157 | $ 63,257
Sales by product, percent | 45.00% | 50.00%

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