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Note 17 - Warrant Liabilities (Tables) | 6 Months Ended
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Jun. 30, 2019
Notes Tables |
Schedule of Warrant Liabilities [Table Text Block] |
|  | As of |  | As of |  | As of |  | Change in Fair Value (gain)/loss
|  | June 30, 2019 |  | March 31, 2019 |  | December 31, 2018 |  | Six Months Ended June 30, 2019 |  | Three Months Ended June 30, 2019
Fair value of the Warrants: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investor warrants |  |  | 32 |  |  |  | 793 |  |  |  | 503 |  |  |  | (471 | ) |  |  | (761 | )
Placement agent warrants |  |  | 103 |  |  |  | 163 |  |  |  | 103 |  |  |  | - |  |  |  | (60 | )
Warrant liabilities |  |  | 135 |  |  |  | 956 |  |  |  | 606 |  |  |  | (471 | ) |  |  | (821 | )
|  | As of |  | As of |  | As of |  | Change in Fair Value (gain)/loss
|  | June 30, 2018 |  | March 31, 2018 |  | January 17, 2018 |  | Six Months Ended June 30, 2018 |  | Three Months Ended June 30, 2018
Fair value of the Warrants: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investor warrants |  |  | 1,103 |  |  |  | 664 |  |  |  | 1,890 |  |  |  | (787 | ) |  |  | 439 |
Placement agent warrants |  |  | 224 |  |  |  | 137 |  |  |  | 385 |  |  |  | (161 | ) |  |  | 87 |
Warrant liabilities |  |  | 1,327 |  |  |  | 801 |  |  |  | 2,275 |  |  |  | (948 | ) |  |  | 526 |
Schedule of Warrant Activity [Table Text Block] |
|  | Warrant Outstanding |  | Warrant Exercisable
|  | Number of underlying shares |  | Weighted Average Remaining Contractual Life (Years) |  | Weighted Average Exercise Price |  | Number of underlying shares |  | Weighted Average Remaining Contractual Life (Years) |  | Weighted Average Exercise Price
Balance, January 1, 2019 |  |  | 774,000 |  |  |  | 1.63 |  |  | $ | 6.60 |  |  |  | 774,000 |  |  |  | 1.63 |  |  | $ | 6.60 |
Granted/Vested |  |  | - |  |  |  |  |  |  |  |  |  |  |  | - |  |  |  |  |  |  |  |  |
Forfeited |  |  | - |  |  |  |  |  |  |  |  |  |  |  | - |  |  |  |  |  |  |  |  |
Exercised |  |  | - |  |  |  |  |  |  |  |  |  |  |  | - |  |  |  |  |  |  |  |  |
Balance, June 30, 2019 (Unaudited) |  |  | 774,000 |  |  |  | 1.13 |  |  | $ | 6.60 |  |  |  | 774,000 |  |  |  | 1.13 |  |  | $ | 6.60 |
Warrant [Member] |
Notes Tables |
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] |
|  | Investors warrants |  | Placement agent warrants
|  | December 31, 2018 |  | March 31, 2019 |  | June 30, 2019 |  | December 31, 2018 |  | March 31, 2019 |  | June 30, 2019
Stock price |  | $ | 1.34 |  |  | $ | 1.95 |  |  | $ | 1.35 |  |  | $ | 1.34 |  |  | $ | 1.95 |  |  | $ | 1.35 |
Years to maturity |  |  | 1.55 |  |  |  | 1.30 |  |  |  | 1.10 |  |  |  | 2.05 |  |  |  | 1.80 |  |  |  | 1.55 |
Risk-free interest rate |  |  | 2.50 | % |  |  | 2.27 | % |  |  | 1.73 | % |  |  | 2.50 | % |  |  | 2.27 | % |  |  | 1.73 | %
Dividend yield |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Expected volatility |  |  | 199 | % |  |  | 216 | % |  |  | 90 | % |  |  | 176 | % |  |  | 187 | % |  |  | 202 | %
Exercise Price |  | $ | 6.60 |  |  | $ | 6.60 |  |  | $ | 6.60 |  |  | $ | 6.60 |  |  | $ | 6.60 |  |  | $ | 6.60 |
Fair value of the warrant |  | $ | 0.78 |  |  | $ | 1.23 |  |  | $ | 0.05 |  |  | $ | 0.80 |  |  | $ | 1.26 |  |  | $ | 0.80 |
|  | Investors warrants |  | Placement agent warrants
|  | January 17, 2018 |  | March 31, 2018 |  | June 30, 2018 |  | January 17, 2018 |  | March 31, 2018 |  | June 30, 2018
Stock price |  | $ | 3.98 |  |  | $ | 1.67 |  |  | $ | 2.52 |  |  | $ | 3.98 |  |  | $ | 1.67 |  |  | $ | 2.52 |
Years to maturity |  |  | 2.50 |  |  |  | 2.30 |  |  |  | 2.10 |  |  |  | 3.00 |  |  |  | 2.80 |  |  |  | 2.55 |
Risk-free interest rate |  |  | 2.22 | % |  |  | 2.35 | % |  |  | 2.53 | % |  |  | 2.39 | % |  |  | 2.50 | % |  |  | 2.56 | %
Dividend yield |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Expected volatility |  |  | 158 | % |  |  | 164 | % |  |  | 174 | % |  |  | 147 | % |  |  | 152 | % |  |  | 159 | %
Exercise Price |  | $ | 6.60 |  |  | $ | 6.60 |  |  | $ | 6.60 |  |  | $ | 6.60 |  |  | $ | 6.60 |  |  | $ | 6.60 |
Fair value of the warrant |  | $ | 2.93 |  |  | $ | 1.03 |  |  | $ | 1.71 |  |  | $ | 2.99 |  |  | $ | 1.06 |  |  | $ | 1.74 |

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