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Note 2 - Revenue (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Disaggregation of Revenue [Table Text Block]
Year ended December 31,
(in thousands)
  
201
9
    
201
8
  
License
   $
5,725
     $
1,349
  
Professional services
    
19,203
      
11,041
  
Processing and maintenance
    
7,650
      
6,394
  
Third party
    
1,725
      
1,316
  
Total
   $
34,303
     $
20,100
  
Year ended December 31,
(in thousands)
  
201
9
    
201
8
  
European Union
   $
3,834
     $
2,745
  
United States
    
30,469
      
17,355
  
Total
   $
34,303
     $
20,100