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Note 6 - Accrued Expenses (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
   
March 31, 2020
   
December 31, 2019
 
Accrued professional fees
  $
224,719
    $
276,239
 
PayOnline accrual
   
66,430
     
69,039
 
Accrued interest
   
40,892
     
43,021
 
Accrued bonus
   
1,429,934
     
1,318,060
 
Accrued foreign taxes
   
6,081
     
2,064
 
Other accrued expenses
   
233,035
     
91,921
 
Total accrued expenses   $
2,001,091
    $
1,800,344