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Note 6 - Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
December 31,
  
   
201
7
    
2016
  
Cost:
                
Computers and equipment
   $
21,465
     $
20,636
  
Office furniture and equipment
    
1,429
      
1,537
  
Leasehold improvements
    
5,060
      
5,004
  
                 
     
27,954
      
27,177
  
Less - accumulated depreciation
    
24,770
      
23,047
  
                 
Depreciated cost
   $
3,184
     $
4,130