Note 5 - Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Accrued payroll and payroll related expenses	$ 182,708	$ 409,889
Accrued professional fees	48,338	69,231
Accrued clinical studies expenses	57,378	34,000
Other	70,108	92,106
Total	$ 358,532	$ 605,226