Note 6 - Accounts Payable and Accrued Expenses - Accounts Payable and Accrued Expenses (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020	Dec. 30, 2020
Accounts payable	$ 3,188,759	$ 1,134,893
Accrued warrant liability	945,736	0
Accrued payroll	135,075	217,319
Accrued interest and fees	921,527	647,393
Accrued legal settlement fee	275,000	0
Other accrued expenses	462,708	688,242
Accounts Payable and Accrued Liabilities, Current, Total	$ 5,928,805	$ 2,687,847	$ 2,687,847