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Note 5 - Stockholders' Equity and Dilutive Equity Instruments (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 02, 2024 | Jul. 31, 2023 | Jun. 30, 2024 | Dec. 31, 2023 | Feb. 29, 2024 | Nov. 30, 2023 | Jun. 30, 2023
Share Repurchase Program [Member] |  |  |  |  |  |  |
Share Repurchase Program, Authorized, Amount | $ 66.7 |  |  |  | $ 48.6 | $ 35.0 |
Stock Repurchased and Retired During Period, Shares (in shares) |  |  | 347,954 | 590,499 |  |  |
Stock Repurchased and Retired During Period, Value |  |  | $ 32.9 | $ 35.0 |  |  |
Shares Acquired, Average Cost Per Share (in dollars per share) |  |  | $ 94.52 | $ 59.29 |  |  |
Share Repurchase Program, Excise Tax, Percent |  |  | 1.00% | 1.00% |  |  |
Share Repurchase Program, Increase in Authorized Amount | $ 18.1 |  |  |  |  |  |
Out-of-the-money Warrants [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  | 782,993 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 861,292 |  |  |  |
New Creditor Warrants [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  | 1 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 0.001 |  |  |  | $ 0.001
GLF Equity Warrants [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 100 |  |  |  |
Series A Warrants [Member] |  |  |  |  |  |  |
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, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 62.28 |  |  |  |  |
Series A and B Warrants [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  | 2,000,000 |  |  |  |  |
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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