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Note 6 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Thousands | Jun. 01, 2020 USD ($) $ / shares shares
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Stock Issued During Period, Shares, New Issues (in shares) | shares | 22,044
Shares Issued, Price Per Share (in dollars per share) | $ 4.50
Proceeds from Issuance or Sale of Equity, Total | $ | $ 108,096
Warrants Issued in Public Offering [Member] |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares | 3,511
Class of Warrant or Right, Warrants Issued, Price Per Warrant (in dollars per share) | $ 4.49
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 0.01

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