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Note 3 - Revenue (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Disaggregation of Revenue [Table Text Block]
Year ended December 31,
(in thousands)
  
2018
    
2017
  
License
   $
1,349
     $
90
  
Professional services
    
11,041
      
3,509
  
Processing and maintenance
    
6,394
      
5,082
  
Third party
    
1,316
      
498
  
Total
   $
20,100
     $
9,179
  
Year ended December 31,
(in thousands)
  
2018
    
2017
  
European Union
   $
2,745
     $
2,535
  
United States
    
17,355
      
6,644
  
Total
   $
20,100
     $
9,179