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Note 6 - Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
December 31,
  
   
201
8
    
2017
  
Cost:
                
Computers and equipment
   $
22,139
     $
21,465
  
Office furniture and equipment
    
1,471
      
1,429
  
Leasehold improvements
    
5,221
      
5,060
  
                 
     
28,831
      
27,954
  
Less - accumulated depreciation
    
26,083
      
24,770
  
                 
Depreciated cost
   $
2,748
     $
3,184