Note 6 - Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Accrued payroll and payroll related expenses	$ 661,061	$ 879,971
Accrued professional fees	163,269	247,704
Accrued clinical studies expenses	766,916	786,579
Other accrued expenses	77,744	65,935
Total	$ 1,668,990	$ 1,980,189