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Note 14 - Subsequent Event (Details Textual) - USD ($) |  | 1 Months Ended | 2 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 15, 2016 | Oct. 31, 2014 | May. 30, 2013 | Jan. 17, 2013 | Feb. 28, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Subsequent Event [Member] | Series C Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |
Common stock conversion (in shares) |  |  |  |  | 1,400,000 |  |  |
Subsequent Event [Member] | Series E Warrants [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Fee | $ 0.02916 |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period | 3,664,588 |  |  |  |  |  |  |
Proceeds from Warrant Exercises | $ 238,198 |  |  |  |  |  |  |
General and Administrative Expense | $ 469,800 |  |  |  |  |  |  |
Proceeds from Warrant Exercises |  | $ 873,400 | $ 583,333 | $ 1,060,000 |  |  |  |
General and Administrative Expense |  |  |  |  |  | $ 1,429,731 | $ 1,807,605 | $ 1,792,160

X
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X
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- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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