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Note 6 - Stockholders' Equity and Dilutive Equity Instruments (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2023 | Jun. 30, 2023 | Jun. 30, 2022
Out-of-the-money Warrants [Member] |  |  |
Class of Warrant or Right, Outstanding (in shares) |  | 5,923,399 | 5,923,399
Series A Warrants [Member] |  |  |
Class of Warrant or Right, Outstanding (in shares) |  | 2,400,000 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 57.06 |
Series B Warrants [Member] |  |  |
Class of Warrant or Right, Outstanding (in shares) |  | 2,600,000 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 62.28 |
GLF Equity Warrants [Member] |  |  |
Class of Warrant or Right, Outstanding (in shares) |  | 900,000 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 100.00 |
Series A and B Warrants [Member] | Subsequent Event [Member] |  |  |
Class of Warrant or Right, Outstanding (in shares) | 2,000,000.0 |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 1,900,000 |  |
Proceeds from Warrant Exercises | $ 111.5 |  |
Class of Warrant or Right, Expired (in shares) | 3,100,000 |  |

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