Note 17 - Warrant Liabilities (Details Textual)	Jan. 17, 2018 $ / shares shares
Investor Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	645,000
Placement Agent Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	129,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 6.60
Private Placement [Member]
Stock Issued During Period, Shares, New Issues	2,150,001
Shares Issued, Price Per Share | $ / shares	$ 5.15