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Note 7 - Stockholders' Equity (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015
Notes Tables |  |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
Expected dividend yield |  |  | 0% |  |
Risk free interest rate |  | 1.01% | - | 2.43% |
Expected life in years |  |  | 5 |  |
Expected volatility |  | 85% | - | 129% |
|  | 2015 |  | 2014 |
Expected dividend yield |  |  | 0% |  |  |  | 0 | %
Risk free interest rate |  | 1.66% | - | 2.43% |  |  | 2.30 | %
Expected life in years |  |  | 10 |  |  |  | 10 |
Expected volatility |  |  | 85% |  |  |  | 85 | %
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Number |  |  | Exercise Price |  |  | Weighted Average Exercise Price |
Stock Options |  |  |  |  |  |  |  |  |  |  |  |
Outstanding January 1, 2016 |  |  | 1,707,744 |  |  |  |  |  |  | $ | 0.84 |
Granted |  |  | 1,301,084 |  |  | $ | 1.25 |  |  |  |  |
Expired |  |  | (416,599 | ) |  |  |  |  |  |  |  |
Outstanding June 30, 2016 |  |  | 2,592,229 |  |  |  |  |  |  | $ | 1.04 |
|  |  |  |  |  | Exercise |  |  | Weighted Average |
|  | Number |  |  | Price |  |  | Exercise Price |
Stock Options |  |  |  |  |  |  |  |  |  |  |  |
Outstanding January 1, 2014 |  |  | 977,744 |  |  |  |  |  |  | $ | 0.60 |
Granted |  |  | 240,000 |  |  | $ | 1.00 |  |  |  |  |
Outstanding December, 31, 2014 |  |  | 1,217,744 |  |  |  |  |  |  | $ | 0.68 |
Granted |  |  | 490,000 |  |  | $ | 1.25 |  |  |  |  |
Outstanding December, 31, 2015 |  |  | 1,707,744 |  |  |  |  |  |  | $ | 0.84 |
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] |
|  | Number |  |  | Exercise Price |  |  | Weighted Average Exercise Price |
Warrants |  |  |  |  |  |  |  |  |  |  |  |
Outstanding January 1, 2016 |  |  | 3,403,367 |  |  |  |  |  |  | $ | 1.05 |
Granted |  |  | 423,291 |  |  | $ | 1.25 |  |  |  |  |
Outstanding June 30, 2016 |  |  | 3,826,658 |  |  |  |  |  |  | $ | 1.07 |
|  |  |  |  |  | Exercise |  |  | Weighted Average |
|  | Number |  |  | Price |  |  | Exercise Price |
Warrants |  |  |  |  |  |  |  |  |  |  |  |
Outstanding January 1, 2014 |  |  | 3,153,367 |  |  |  |  |  |  | $ | 1.01 |
Granted |  |  | - |  |  | $ | - |  |  |  |  |
Outstanding December, 31, 2014 |  |  | 3,153,367 |  |  |  |  |  |  | $ | 1.00 |
Granted |  |  | 250,000 |  |  | $ | 1.25 |  |  |  |  |
Outstanding December, 31, 2015 |  |  | 3,403,367 |  |  |  |  |  |  | $ | 1.05 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 + Details
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