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Note 5 - Other Comprehensive Income (Tables)
3 Months Ended
Mar. 31, 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
   
433,065
     
433,065
 
                 
Ending Balance as of March 31, 2018
   
(4,932,299
)    
(4,932,299
)