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Note 8 - Stockholders' Equity (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2017 | Oct. 31, 2014 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Stock Issued During Period, Shares, Warrants Exercised | 983,334 |  |  |  |  |  |
Proceeds from Warrant Exercises | $ 49,167 |  |  |  |  |  |
General and Administrative Expense |  |  | $ 292,667 | $ 906,505 | $ 2,131,426 | $ 1,429,731 | $ 1,807,605
Expense Associated with Warrant Modifications [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised |  | 3,176,000 |  |  | 21,884,420 |  |
Proceeds from Warrant Exercises |  | $ 873,400 |  |  | $ 1,339,801 |  |
General and Administrative Expense |  |  |  | 469,799 | 912,862 | 0 | 277,912
2006 Equity Incentive Plan [Member] |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  | 14,580 | $ 13,686 | 54,805 | $ 67,905 | $ 101,191
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 117,404 |  | $ 117,404 |  | $ 132,032 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  | 2 years 109 days |  | 2 years 182 days |  |

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- Definition Number of new shares of common stock issued during the period upon exercise of warrants. + References No definition available. + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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=63488584&loc=d3e20235-122688 + Details
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