Note 6 - Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Accrued payroll and payroll related expenses	$ 399,847	$ 879,971
Accrued professional fees	142,668	247,704
Accrued clinical studies expenses	1,472,119	786,579
Other	127,999	65,935
Total	$ 2,142,633	$ 1,980,189