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Note 4 - Revenue Recognition (Tables)
 12 Months Ended
Jan. 31, 2021
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
2020
    
2019
  
   
Sales
    
% to Total
    
Sales
    
% to Total
  
Products   $
11,496
      
14
 %   $
15,991
      
12
 %
                                 
Specialty Piping Systems and Coating
      
 
      
 
      
 
      
 
Revenue recognized under input method    
35,041
      
41
 %    
48,415
      
38
 %
Revenue recognized under output method    
38,157
      
45
 %    
63,257
      
50
 %
Total
   $
84,694
      
100
 %   $
127,663
      
100
 %
Schedule of Assumptions for Long-Duration Contracts by Product and Guarantee [Table Text Block]
(In thousands)
  
2020
    
2019
  
Costs incurred on uncompleted contracts   $
17,543
     $
15,553
  
Estimated earnings    
9,651
      
8,641
  
Earned revenue
    
27,194
      
24,194
  
Less billings to date    
23,949
      
23,201
  
Costs in excess of billings, net
   $
3,245
     $
993
  
Balance sheet classification
      
 
      
 
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts   $
4,007
     $
2,166
  
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts    
(762
 )    
(1,173
 )
Costs in excess of billings, net
   $
3,245
     $
993