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Note 6 - Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
 
Foreign Currency Items
    
Total
Accumulated Other Comprehensive Income
  
                 
Beginning balance as of January 1, 2018
   $
(5,365,364
 )   $
(5,365,364
 )
                 
Current period change, net of tax
    
(110,605
 )    
(110,605
 )
                 
Ending Balance as of September 30, 2018
    
(5,475,969
 )    
(5,475,969
 )