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