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Note 4 - Revenue Recognition - Revenues by Revenue Class (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2021
Jul. 31, 2020
Sales by product $ 39,804 $ 20,364 $ 64,227 $ 43,106
Sales by product, percent 100.00% 100.00% 100.00% 100.00%
Product [Member] | Transferred at Point in Time [Member]        
Sales by product $ 4,548 $ 1,703 $ 7,135 $ 6,168
Sales by product, percent 11.00% 8.00% 11.00% 14.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Input Method [Member]        
Sales by product $ 13,999 $ 9,784 $ 23,952 $ 18,346
Sales by product, percent 35.00% 48.00% 37.00% 43.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time Using Output Method [Member]        
Sales by product $ 21,257 $ 8,877 $ 33,140 $ 18,592
Sales by product, percent 54.00% 44.00% 52.00% 43.00%