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Note 6 - Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 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
    
235,876
      
235,876
  
                 
Ending Balance as of March 31, 2019
    
(5,814,471
 )    
(5,814,471
 )