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Note 15 - Share Capital (Tables)
12 Months Ended
Jan. 31, 2020
Notes Tables  
Schedule of Common Stock Outstanding Roll Forward [Table Text Block]
     
January 31,
     
January 31,
     
January 31,
 
(thousands of shares)     2020       2019       2018  
Balance, beginning of year    
76,865
     
76,773
     
75,875
 
Shares issued:                        
Stock options and share units exercised    
95
     
46
     
141
 
Issuance of common shares    
6,900
     
     
 
Acquisitions (Note 3)    
296
     
46
     
757
 
Balance, end of year    
84,156
     
76,865
     
76,773