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Note 17 - Subsequent Events (Details Textual) - Subsequent Event [Member] - USD ($) $ / shares in Units, $ in Millions | Mar. 25, 2017 | Mar. 14, 2017
--- | --- | ---
Purchase Agreement, Maximum Amount of Securities That May Be Sold |  | $ 1.0
Purchase Agreement, Maximum Amount of Securities That May Be Sold, Increased Amount |  | $ 25.0
Private Placement [Member] |  |
Class of Warrant or Right, Term | 5 years |
Private Placement [Member] | Waarants Attached to Series A Convertible Preferred Stock [Member] |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right |  | 1
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 2.22
Series A Convertible Preferred Stock [Member] | Private Placement [Member] |  |
Convertible Preferred Stock, Shares Issued upon Conversion | 1 |
Stock Issued During Period, Shares, New Issues |  | 7,837,023
Shares Issued, Price Per Share |  | $ 2.02
Proceeds from Issuance of Private Placement |  | $ 14.1
Payments of Stock Issuance Costs |  | $ 1.7

X
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