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Note 8 - Common Stock (Details Textual) - USD ($) | 1 Months Ended | 5 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2014 | Sep. 30, 2014 | Oct. 31, 2013 | May. 30, 2013 | Jan. 17, 2013 | Nov. 30, 2014 | May. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | May. 14, 2013 | Apr. 30, 2013 | Dec. 31, 2012
Common Stock Warrants [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  | 2,933,333 |  |  |  |  |  |
Proceeds from Warrant Exercises |  |  |  |  |  |  | $ 1,643,333 |  |  |  |  |  |
Warrant Exercise Price Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding |  |  |  |  |  |  |  |  |  |  | 1,166,666 |  |
Warrants with Modified Exercise Prices [Member] | Scenario, Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 16.50 |  |  |  |  |  |  |  |  |  |  |
Warrants with Modified Exercise Prices [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding |  | 818,376 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 1 |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services |  |  | 50,000 |  |  |  |  |  | 378,205 | 50,000 |  |  |
Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Other General and Administrative Expense |  |  |  | $ 19,617 | $ 218,551 |  |  |  |  |  |  |  |
General and Administrative Expense [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  | $ 20,500 |  |  |  |  |  |  |  |  |  |
Third Party Consulting Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services |  |  |  |  |  | 378,205 |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |
Expense Associated with Warrant Modifications [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
General and Administrative Expense |  | $ 39,711 |  |  |  |  |  | $ 0 | $ 39,712 | $ 238,168 |  |  |
Proceeds from Warrant Exercises | $ 873,400 |  |  | $ 583,333 | $ 1,060,000 |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised | 3,176,000 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding |  |  |  |  | 2,933,333 |  |  | 56,442,157 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  | $ 0.60 |  |  | $ 0.14 |  |  | $ 0.50 | $ 0.60 | $ 0.75
Number Of Warrants Issued During Period |  |  |  |  | 1,766,667 |  |  |  |  |  |  |  |
Class of Warrant or Right, Unissued |  |  |  |  | 1,166,666 |  |  |  |  |  |  |  |
General and Administrative Expense |  |  |  |  |  |  |  | $ 1,429,731 | $ 1,807,605 | $ 1,792,160 |  |  |
Warrant Exercise Fee Per Share | $ 0.075 |  |  |  |  |  |  |  |  |  |  |  |

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