Note 4 - Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Accrued payroll and payroll related expenses	$ 252,194	$ 182,708
Accrued professional fees		48,338
Accrued clinical studies expenses	52,705	57,378
Other accrued expenses	12,176	70,108
Total	$ 317,075	$ 358,532