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Note 5 - Other Comprehensive Income (Tables)
6 Months Ended
Jun. 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
   
(342,432)
     
(342,432)
 
                 
Ending Balance as of June 30, 2018
   
(5,707,796)
     
(5,707,796)