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Note 13 - Earnings Per Share (Details Textual) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Two Thousand Twenty One Convertible Notes [Member]        
Antidilutive Securities Excluded From Computation of Earnings Per Share, Amount, Value   $ 25   $ 25
Share-Based Payment Arrangement, Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 4.1 3.6 4.1 3.6
Restricted Stock Units (RSUs) [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)     0.7 0.2
Series C Preferred Stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 1.1 1.1 1.1 1.1
Series B Preferred Stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)       1.0