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Note 6 - Stockholders' Equity and Dilutive Equity Instruments (Details Textual) - USD ($) $ / shares in Units, $ in Millions | Jun. 24, 2022 | Jun. 30, 2022 | Apr. 22, 2022 | Jun. 30, 2021
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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, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 57.06 |  | $ 57.06
Series B Warrants [Member] |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | 62.28 |  | 62.28
GLF Equity Warrants [Member] |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 100.00 |  | $ 100.00
Warrans Issued to Acquire Swire Pacific Offshore Holdings Ltd. [Member] |  |  |  |
Fair Value Adjustment of Warrants | $ 14.2 |  |  |
Share Price (in dollars per share) | $ 21.83 |  | $ 20.08 |
Adjustments to Additional Paid in Capital, Warrant Issued | $ 176.8 |  |  |

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