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Note 4 - Revenue Recognition (Tables)
 3 Months Ended
Apr. 30, 2019
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Three Months Ended April 30,
  
   
2019
    
2018
  
   
Sales
    
% to Total
    
Sales
    
% to Total
  
Products
   
4,898
      
20
 %    
2,429
      
8
 %
                                 
Specialty Piping Systems and Coating
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Revenue recognized under input method
    
8,786
      
36
 %    
11,102
      
38
 %
Revenue recognized under output method
    
10,592
      
44
 %    
15,358
      
53
 %
Total
   
24,276
      
100
 %    
28,889
      
100
 %
Contract with Customer, Asset and Liability [Table Text Block]
   
Contract Assets
  
Balance January 31, 2019
 
$
1,653
  
Costs and gross profit recognized during the period for uncompleted contracts from the prior period
    
(1,038
 )
Costs and deferred gross profit incurred on uncompleted contracts not billed at the end of the current period
    
1,368
  
Closing Balance at April 30, 2019
   
1,983
  
   
Contract Liabilities
  
Balance January 31, 2019
 
$
1,569
  
Revenue recognized during the period for uncompleted contracts from the prior period
    
(444
 )
New contracts entered into that are uncompleted at the end of the current period
    
721
  
Closing Balance at April 30, 2019
  
 
1,846