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Note 4 - Property and Equipment, Net (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Property, Plant and Equipment [Table Text Block]
    December 31,
    2016   2015
Cost:        
Computer equipment   $
7,800
     $
6,342
  
Office furniture and equipment    
2,094
      
1,558
  
Leasehold improvements    
7,459
      
5,884
  
     
17,353
      
13,784
  
Accumulated depreciation    
7,443
      
5,519
  
Property and equipment, net   $
9,910
     $
8,265