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Note 6 - Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
           
Accumulated
  
   
Foreign
    
Other
  
   
Currency
    
Comprehensive
  
   
Items
    
Loss
  
Beginning balance
   $
(5,365,364
 )   $
(5,365,364
 )
Current period change
    
(684,983
 )    
(684,983
 )
Ending balance
   $
(6,050,347
 )   $
(6,050,347
 )
           
Accumulated
  
   
Foreign
    
Other
  
   
Currency
    
Comprehensive
  
   
Items
    
Loss
  
Beginning balance
   $
(5,593,878
 )   $
(5,593,878
 )
Current period change
    
228,514
      
228,514
  
Ending balance
   $
(5,365,364
 )   $
(5,365,364
 )