Note 3 - Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Accrued commissions	$ 381,652		$ 530,908
Reserve for merchant losses	490,893	$ 506,153	506,153
Other accrued expenses	214,824		92,385
Accrued taxes	160,605		99,850
Accrued salaries	130,315		131,255
Total accrued expenses	$ 1,378,289	$ 1,360,551	$ 1,360,551