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Note 9 - Stockholder's Equity (Tables) | 12 Months Ended
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Dec. 31, 2015
Notes Tables |
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] |
Issue Date |  | Number of Underlying Shares of Common Stock |  |  | Per Share Exercise Price |  | Expiration Date
February 2, 2011 |  |  | 2,000 |  |  |  | 100.00 |  | February 2, 2016
February 23, 2011 |  |  | 1,500 |  |  |  | 100.00 |  | February 23, 2016
March 15, 2011 |  |  | 1,200 |  |  |  | 100.00 |  | March 15, 2016
April 6, 2011 |  |  | 2,000 |  |  |  | 100.00 |  | April 6, 2016
April 15, 2011 |  |  | 1,200 |  |  |  | 100.00 |  | April 15, 2016
April 26, 2011 |  |  | 2,500 |  |  |  | 100.00 |  | April 26, 2016
April 29, 2011 |  |  | 3,000 |  |  |  | 100.00 |  | April 29, 2016
June 26, 2011 |  |  | 104,057 |  |  |  | 65.00 |  | June 26, 2016
June 26, 2011 |  |  | 52,028 |  |  |  | 100.00 |  | June 26, 2016
July 1, 2011 |  |  | 5,300 |  |  |  | 65.00 |  | July 1, 2016
May 23, 2012 |  |  | 30,000 |  |  |  | 30.00 |  | May 23, 2017
July 1, 2012 |  |  | 10,000 |  |  |  | 75.00 |  | July 1, 2017
August 20, 2012 |  |  | 90,000 |  |  |  | 38.00 |  | August 20, 2017
March 27, 2013 |  |  | 173,917 |  |  |  | 3.00 |  | March 27, 2018
March 17, 2014 |  |  | 15,000 |  |  |  | 4.90 |  | March 17, 2019
April 29, 2014 |  |  | 832,950 |  |  |  | 4.80 |  | April 29, 2018
April 29, 2014 |  |  | 277,650 |  |  |  | 4.80 |  | April 29, 2018
April 29, 2014 |  |  | 35,000 |  |  |  | 4.80 |  | April 29, 2018
April 29, 2014 |  |  | 351,060 |  |  |  | 2.00 |  | April 29, 2018
May 6, 2014 |  |  | 1,025,438 |  |  |  | 4.80 |  | May 6, 2018
May 6, 2014 |  |  | 341,813 |  |  |  | 4.80 |  | May 6, 2018
May 21, 2014 |  |  | 261,693 |  |  |  | 4.80 |  | May 21, 2018
May 21, 2014 |  |  | 89,731 |  |  |  | 4.80 |  | May 21, 2018
June 13, 2014 |  |  | 533,625 |  |  |  | 4.80 |  | June 13, 2018
June 13, 2014 |  |  | 177,875 |  |  |  | 4.80 |  | June 13, 2018
June 13, 2014 |  |  | 16,037 |  |  |  | 4.80 |  | June 13, 2018
July 10, 2014 |  |  | 15,000 |  |  |  | 4.80 |  | July 10, 2018
July 10, 2014 |  |  | 5,000 |  |  |  | 4.80 |  | July 10, 2018
October 21, 2014 |  |  | 75,000 |  |  |  | 4.80 |  | October 21, 2018
December 8, 2014 |  |  | 250,000 |  |  |  | 3.75 |  | December 8, 2019
|  |  | 4,781,574 |  |  |  |  |  |
Schedule of Warrant Valuation Assumptions [Table Text Block] |
|  | 2014 |
Risk-free interest rate |  | 1.11 | – | 1.67% |
Expected life in years |  | 4.0 | – | 5.0 |
Expected volatility |  | 64% | - | 66% |
Expected dividend yield |  |  | — |  |

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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 (b) expected volatility (c) expected dividends, (d) risk-free rate(s). + 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://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=51659978&loc=d3e25284-112666 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Article 5 + Details
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