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Note 10 - Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Foreign Currency Translation
    
AOCL
  
Balance at January 1, 2017
   $
(85
 )   $
(85
 )
Foreign currency translation adjustment
    
52
      
52
  
Balance at December 31, 2017
  
$
(33
)
  
$
(33
)