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Note 7 - Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2019
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, 2019
   $
(6,050,347
 )   $
(6,050,347
 )
                 
Current period change, net of tax
    
15,603
      
15,603
  
                 
Ending Balance as of September 30, 2019
    
(6,034,744
 )    
(6,034,744
 )