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Note 4 - Property and Equipment, Net (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
 
 
December 31,
 
 
2017
 
2016
Cost:        
Computer equipment   $
8,473
     $
7,800
  
Office furniture and equipment    
2,263
      
2,094
  
Leasehold improvements    
9,163
      
7,459
  
     
19,899
      
17,353
  
Accumulated depreciation    
8,003
      
7,443
  
Property and equipment, net   $
11,896
     $
9,910