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Note 10 - Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Foreign
    
 
 
 
   
Currency
    
 
 
 
   
Translation
    
AOCL
  
Balance at January 1, 2018
   $
(33
 )   $
(33
 )
Foreign currency translation adjustment
    
(18
 )    
(18
 )
Balance at March 31, 2018
  
$
(51
)
  
$
(51
)