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Revenue Recognition (Tables)
 3 Months Ended
Apr. 30, 2018
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue

 
April 30, 2018
April 30, 2017
 
Sales
% to Total
Sales
% to Total
Products
2,429

8
%
1,331

6
%
 
 
 
 
 
Specialty Piping Systems and Coating
 
 
 
 
Revenue recognized under input method
11,102

38
%
9,117

39
%
Revenue recognized under output method
15,358

54
%
13,053

55
%
Total
28,889

100
%
23,501

100
%