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Note 7 - Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Accrued interest payable | $ 37,415 | $ 29,359
Accrued Series A dividends | 1,062,314 |
Accrued payroll and payroll related expenses | 312,221 | 399,740
Accrued professional fees | 122,711 | 72,855
Accrued clinical studies expenses | 63,350 | 220,978
Other | 30,840 | 151,332
Total | $ 1,628,851 | $ 874,264

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