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Note 7 - Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Comprehensive Income (Loss) [Table Text Block]
   
Three-month periods ended
March 31,
  
   
2018
    
2017
  
Net loss
   $
(1,256,459
)
   $
(55,224
)
Other comprehensive loss:
                
Foreign currency translation adjustment
    
17,630
      
4,080
  
Comprehensive loss
   $
(1,238,829
)
   $
(51,144
)
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
March 31,
2018
    
December 31,
2017
  
Accumulated other comprehensive loss
   $
(23,910
)
   $
(41,540
)