Note 3 - Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($)	Sep. 30, 2020	Dec. 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