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Note 6 - Other Comprehensive Income (Tables)
6 Months Ended
Jun. 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
   
297,209
     
297,209
 
                 
Ending Balance as of June 30, 2019
   
(5,753,138
)    
(5,753,138
)