XML 31 R20.htm IDEA: XBRL DOCUMENT v3.19.1
Note 1 - Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Financing Receivable, Allowance for Credit Loss [Table Text Block]
   
March 31,
201
9
    
December 31,
201
8
  
Allowance for doubtful accounts at the beginning of the period
   $
971,772
     $
660,581
  
Bad debt expense
    
0
      
353,562
  
Receivables written off during the periods
    
0
      
0
  
Effect of currency translation
    
(18,245
)
    
(42,371
 )
Allowance for doubtful accounts at the end of the period
   $
953,527
     $
971,772