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Note 8 - Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2019
Notes Tables |
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] |
|  | Warrant shares outstanding |  |  | Weighted Average exercise price |  |  | Weighted Average remaining life |  |  | Intrinsic value |
Outstanding at January 1, 2019 |  |  | 1,592,775 |  |  | $ | 2.55 |  |  | $ | 0.48 |  |  |  | - |
Issued |  |  | 1,749,171 |  |  | $ | 0.50 |  |  | $ | 4.60 |  |  |  | - |
Exercised |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Expired or cancelled |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Outstanding and exercisable at June 30, 2019 |  |  | 3,341,946 |  |  | $ | 1.48 |  |  | $ | 2.60 |  |  |  | - |
Schedule of Warrant or Right Outstanding, Valuation Assumptions [Table Text Block] |
|  | 2016 Warrants |  |  | 2019 Warrants |
Expected Term |  | 0.4 years |  |  | 5 years |
Volatility |  |  | 100 | % |  |  | 85 | %
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Exercise Price |  | $ | 2.55 |  |  | $ | 0.50 |
Risk-free interest rate |  |  | 2.09 | % |  |  | 2.50 | %
Weighted average fair value of warrants granted |  |  | - |  |  | $ | 0.22 |
Number of shares underlying warrants granted |  |  | 201,044 |  |  |  | 1,749,171 |
Warrant Liabilities [Member] |
Notes Tables |
Schedule of Warrant or Right Outstanding, Valuation Assumptions [Table Text Block] |
|  | 2016 Warrants |  |  | 2019 Warrants |
Expected Term |  | 0.4 years |  |  | 4.6 years |
Volatility |  |  | 100 | % |  |  | 84 | %
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Exercise Price |  | $ | 2.55 |  |  | $ | 0.50 |
Risk-free interest rate |  |  | 2.09 | % |  |  | 1.76 | %
Weighted average fair value of warrants granted |  | $ | - |  |  | $ | 0.21 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of warrants, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References No definition available. + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
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