Note 4 - Income (Loss) Per Share	12 Months Ended
Dec. 31, 2023
Notes to Financial Statements
Earnings Per Share [Text Block]	Note 4 Income (loss) Per Share Basic income (loss) per share is computed by dividing our net income (loss) by the weighted average number of shares of our Common Stock outstanding during the period. Shares of Common Stock outstanding pursuant to the share lending arrangement (the "Share Lending Arrangement") under the Share Lending Agreement (as defined in Note 22) entered into in conjunction with the 2025 Notes (as defined in Note 7) are excluded from the calculation of basic and diluted earnings per share because the borrower of the shares is required under the Share Lending Arrangement to refund any dividends paid on the shares lent. Refer to Note 7. For diluted earnings per share, the dilutive impact of stock options and warrants is determined by applying the “treasury stock” method. The dilutive impact of the 2033 Senior Notes, the 2023 Convertible Notes and the 2025 Notes (each, as defined and discussed in Note 7) has been considered using the “if converted” method. For periods in which their effect would have been antidilutive, no effect is given to Common Stock issuable under outstanding options, warrants or the potentially dilutive shares issuable pursuant to the 2033 Senior Notes, the 2023 Convertible Notes and the 2025 Notes in the dilutive computation. A total of 82,843,173, 55,580,089 and 62,204,391 potential shares of Common Stock have been excluded from the calculation of diluted net income (loss) per share for the years ended December 31, 2023, 2022 and 2021, respectively, because their inclusion would be antidilutive. A full presentation of diluted earnings per share has not been provided because the required adjustments to the numerator and denominator resulted in diluted earnings per share equivalent to basic earnings per share. During the year ended December 31, 2023, 18,750 options were exercised and 549,680 restricted stock units vested, resulting in the issuance of 405,721 shares of Common Stock. Of the 549,680 restricted stock units settled, 162,709 shares of Common Stock were surrendered in lieu of a cash payment via the net exercise feature of the agreements. During the year ended December 31, 2022, an aggregate of 211,187 options were exercised and 1,599,212 restricted stock units were settled, resulting in the issuance of 1,316,570 shares of Common Stock. Of the 1,810,399 exercised and restricted stock units settled, 493,829 shares of Common Stock were surrendered in lieu of a cash payment via the net exercise feature of the related agreements. During the year ended December 31, 2021, 445,437 Common Stock options to purchase shares of our Common Stock were exercised, resulting in the issuance of 445,437 shares of Common Stock. Of the 445,437 Common Stock options exercised, 0 shares of Common Stock were surrendered in lieu of a cash payment via the net exercise feature of the agreements.

Note 4 - Income (Loss) Per Share

12 Months Ended

Dec. 31, 2023

Note 4 Income (loss) Per Share

Basic income (loss) per share is computed by dividing our net income (loss) by the weighted average number of shares of our Common Stock outstanding during the period. Shares of Common Stock outstanding pursuant to the share lending arrangement (the "Share Lending Arrangement") under the Share Lending Agreement (as defined in Note 22) entered into in conjunction with the 2025 Notes (as defined in Note 7) are excluded from the calculation of basic and diluted earnings per share because the borrower of the shares is required under the Share Lending Arrangement to refund any dividends paid on the shares lent. Refer to Note 7. For diluted earnings per share, the dilutive impact of stock options and warrants is determined by applying the “treasury stock” method. The dilutive impact of the 2033 Senior Notes, the 2023 Convertible Notes and the 2025 Notes (each, as defined and discussed in Note 7) has been considered using the “if converted” method. For periods in which their effect would have been antidilutive, no effect is given to Common Stock issuable under outstanding options, warrants or the potentially dilutive shares issuable pursuant to the 2033 Senior Notes, the 2023 Convertible Notes and the 2025 Notes in the dilutive computation.

A total of 82,843,173, 55,580,089 and 62,204,391 potential shares of Common Stock have been excluded from the calculation of diluted net income (loss) per share for the years ended December 31, 2023, 2022 and 2021, respectively, because their inclusion would be antidilutive. A full presentation of diluted earnings per share has not been provided because the required adjustments to the numerator and denominator resulted in diluted earnings per share equivalent to basic earnings per share.

During the year ended December 31, 2023, 18,750 options were exercised and 549,680 restricted stock units vested, resulting in the issuance of 405,721 shares of Common Stock. Of the 549,680 restricted stock units settled, 162,709 shares of Common Stock were surrendered in lieu of a cash payment via the net exercise feature of the agreements.

During the year ended December 31, 2022, an aggregate of 211,187 options were exercised and 1,599,212 restricted stock units were settled, resulting in the issuance of 1,316,570 shares of Common Stock. Of the 1,810,399 exercised and restricted stock units settled, 493,829 shares of Common Stock were surrendered in lieu of a cash payment via the net exercise feature of the related agreements.

During the year ended December 31, 2021, 445,437 Common Stock options to purchase shares of our Common Stock were exercised, resulting in the issuance of 445,437 shares of Common Stock. Of the 445,437 Common Stock options exercised, 0 shares of Common Stock were surrendered in lieu of a cash payment via the net exercise feature of the agreements.