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Note 12 - Earnings Per Share (Details Textual) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Two Thousand Twenty One Convertible Notes [Member]    
Antidilutive Securities Excluded From Computation of Earnings Per Share, Amount, Value   $ 25
Restricted Stock Units (RSUs) [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 0.1 0.4
Dilutive Securities Excluded In Computation Of Earnings Per Share Amount (in shares)   0.5
Share-Based Payment Arrangement, Option [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 4.3 3.8
Dilutive Securities Excluded In Computation Of Earnings Per Share Amount (in shares)   0.9
Series C Preferred Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 1.1 1.0
Series B Preferred Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)   1.0