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Note 13 - Business Segment Information (Tables)
 9 Months Ended
Oct. 31, 2017
Notes Tables  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
   
Three Months Ended
October
31,
    
Nine
Months Ended
October
31,
  
   
2017
    
2016
    
2017
    
2016
  
   
(in thousands)
    
(in thousands)
  
Revenue:
                                
North America
(1)
   $
37,319
     $
33,413
     $
105,845
     $
95,747
  
EMEA
    
21,439
      
19,334
      
64,547
      
58,961
  
Asia Pacific
    
12,550
      
11,932
      
37,683
      
35,749
  
Latin America
    
5,617
      
4,855
      
16,190
      
14,252
  
    $
76,925
     $
69,534
     $
224,265
     $
204,709