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Note 16 - Subsequent Event (Details Textual) - USD ($) $ / shares in Units, $ in Millions | Jan. 22, 2018 | Dec. 31, 2017 | Nov. 01, 2017 | Dec. 31, 2016 | Jan. 07, 2016
--- | --- | --- | --- | --- | ---
Common Stock, Par or Stated Value Per Share |  | $ 0.001 |  | $ 0.001 |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  | 478,200
Share Price |  |  | $ 1.44 |  |
Subsequent Event [Member] |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ 0.001 |  |  |  |
Subsequent Event [Member] | Conversion From Series A Preferred Stock to Common Stock [Member] |  |  |  |  |
Conversion of Stock, Shares Issued | 20,568,632 |  |  |  |
Subsequent Event [Member] | Warrants Issued in Connection with the January 2018 Offering [Member] |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 15,000,000 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 0.80 |  |  |  |
Class of Warrant or Right, Term | 5 years |  |  |  |
Subsequent Event [Member] | Underwriter Warrants [Member] | H.C Wainwright & Co., LLC [Member] |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 1 |  |  |  |
Class of Warrant or Right, Term | 5 years |  |  |  |
Subsequent Event [Member] | Underwriter Warrants [Member] | Maximum [Member] |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 750,000 |  |  |  |
Subsequent Event [Member] | January 2018 Offering [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 15,000,000 |  |  |  |
Share Price | $ 0.80 |  |  |  |
Proceeds from Issuance or Sale of Equity | $ 12 |  |  |  |
Subsequent Event [Member] | January 2018 Offering [Member] | Additional Warrants [Member] |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 1,970,625 |  |  |  |

X
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