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Note 11 - Convertible Senior Notes (Details Textual) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 17, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Nov. 30, 2005
Gain (Loss) on Extinguishment of Debt, Total |  | $ (29,439,000) | $ (0) |
Bear Stearns [Member] |  |  |  |
Loaned Shares Returned and Retired (in shares) |  | 5,677,950 |  |
Conversion of Convertible Senior Notes to Common Stock [Member] |  |  |  |
Debt Conversion, Original Debt, Amount | $ 11,800,000 |  |  |
Unsecured Convertible Senior Notes [Member] |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 300,000,000.0
Convertible Senior Note [Member] |  |  |  |
Extinguishment of Debt, Amount |  | $ 22,100,000 |  |
Repayments of Convertible Debt | 12,100,000 | 30,400,000 |  |
Gain (Loss) on Extinguishment of Debt, Total | (15,300,000) | $ (14,100,000) |  |
Debt Instrument, Convertible, Cash Paid Per $1,000 Principal Held | $ 1,000 |  |  |

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