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Note 7 - Accrued Expenses (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
   
December 31, 2019
   
December 31, 2018
 
Accrued professional fees
  $
276,239
    $
174,915
 
PayOnline accrual
   
69,039
     
1,126,273
 
Accrued interest
   
43,021
     
108,202
 
Accrued bonus
   
1,318,060
     
1,157,556
 
Accrued foreign taxes
   
2,064
     
(45,952
)
Other accrued expenses
   
91,921
     
14,953
 
Total accrued expenses   $
1,800,344
    $
2,535,947