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Note 1 - Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Financing Receivable, Allowance for Credit Loss [Table Text Block]
   
June 30,
201
9
   
December 31,
201
8
 
Allowance for doubtful accounts at the beginning of the period
  $
971,772
    $
660,581
 
Bad debt expense
   
-
     
353,562
 
Receivables written off during the periods
   
(3,494
)
   
-
 
Effect of currency translation
   
(5,773
)
   
(42,371
)
Allowance for doubtful accounts at the end of the period
  $
962,505
    $
971,772