Note 8 - Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Accrued commissions	$ 373,154	$ 530,908
Reserve for processing losses	515,199	506,153
Other accrued expenses	225,412	92,385
Accrued taxes	132,363	99,850
Accrued salaries	217,816	131,255
Total accrued expenses	$ 1,463,944	$ 1,360,551