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Note 7 - Preferred Stock (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 28, 2015 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2014 | Mar. 31, 2017 | Dec. 31, 2015
Common Stock, Par or Stated Value Per Share |  |  | $ 0.001 |  | $ 0.001 | $ 0.001
Preferred Stock, Par or Stated Value Per Share |  |  | $ 0.01 |  | $ 0.01 | $ 0.01
Series A Convertible Preferred Stock [Member] |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share |  |  |  | $ 1,000 |  |
Preferred Stock, Shares Outstanding |  |  | 0 |  |  |
Series B Convertible Preferred Stock [Member] |  |  |  |  |  |
Preferred Stock, Voting Rights |  |  | 0 |  |  |
Preferred Stock, Shares Outstanding |  |  | 100 |  | 100 | 100
Convertible Preferred Stock, Total Conversion Shares |  |  | 285,714 |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  | $ 1,000 |  | $ 1,000 | $ 1,000
Series C Convertible Preferred Stock [Member] |  |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ 983,941 |  |  |  |  |
Preferred Stock, Voting Rights |  |  | 0 |  |  |
Conversion of Stock, Shares Converted |  | 132 |  |  |  |
Preferred Stock, Shares Outstanding |  |  | 2,868 |  | 2,868 | 3,000
Convertible Preferred Stock, Total Conversion Shares |  |  | 57,363,520 |  |  |
Stock Issued During Period, Shares, New Issues | 3,000 |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share | $ 1,000 |  | $ 1,000 |  | $ 1,000 | $ 1,000
Proceeds from Issuance of Preferred Stock, Preference Stock, and Warrants | $ 2,679,810 |  |  |  |  |
Warrants Issued in Connection with Series C Preferred Stock [Member] |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 51,333,331 |  |  |  |  |
Adjustments to Additional Paid in Capital, Warrant Issued | $ 1,695,869 |  |  |  |  |
Conversion from Series A Convertible Preferred Stock to Common Stock [Member] |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  |  | 71 |  |
Conversion of Stock, Shares Issued |  |  |  | 202,857 |  |
Conversion from Series B Convertible Preferred Stock to Common Stock [Member] |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  |  | 1,550 |  |
Conversion of Stock, Shares Issued |  |  |  | 4,428,571 |  |
Conversion from Series C Convertible Preferred Stock to Common Stock [Member] |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  | 132 |  |  |
Conversion of Stock, Shares Issued |  |  | 1,400,000 |  |  |

X
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- Definition Amount of increase in additional paid in capital (APIC) resulting from the issuance of warrants. Includes allocation of proceeds of debt securities issued with detachable stock purchase warrants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=79512289&loc=d3e4724-112606 + Details
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