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Note 17 - Warrant Liabilities (Details Textual) | Jan. 17, 2018 $ / shares shares
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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

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