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Note 6 - Accrued Expenses and Other Current Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Other Current Liabilities [Table Text Block] |
|  | December 31, |
|  | 2018 |  |  | 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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