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Note 6 - Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accrued interest payable |  | $ 37,415
Accrued Series A convertible preferred stock dividends |  | 1,062,314
Accrued payroll and payroll related expenses | 409,889 | 312,221
Accrued professional fees | 69,231 | 122,711
Accrued clinical studies expenses | 34,000 | 63,350
Other | 92,106 | 30,840
Total | $ 605,226 | $ 1,628,851

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