Note 4 - Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Accrued payroll and payroll related expenses	$ 879,971	$ 653,899
Accrued professional fees	247,704	31,809
Accrued clinical studies expenses	786,579	1,055,398
Other	65,935	35,364
Total	$ 1,980,189	$ 1,776,470