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Note 6 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Jun. 01, 2020 | Jun. 30, 2020 | Apr. 24, 2020
Maximum Aggregate Offering Price |  |  | $ 500,000
Stock Issued During Period, Shares, New Issues (in shares) | 22,044,447 | 22,044,000 |
Shares Issued, Price Per Share (in dollars per share) | $ 4.50 |  |
Proceeds from Issuance or Sale of Equity, Total | $ 107,665 |  |
Warrants Issued in Public Offering [Member] |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 3,511,111 |  |
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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