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Note 3 - Accrued Expenses (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
   
September 30, 2020
 
December 31, 2019
                 
Accrued commissions
  $
391,616
  $
530,908
Reserve for merchant losses
 
491,659
 
506,153
Other accrued expenses
 
74,432
 
92,385
Accrued taxes
 
107,862
 
99,850
Accrued salaries
 
238,188
 
131,255
Total accrued expenses
  $
1,303,757
  $
1,360,551