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Note 21 - Earnings Per Share (Details Textual) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
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) 3.9 3.3 2.9
Series C Preferred Stock [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 1.1 1.1 1.0
Series B Preferred Stock [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)   1.0 1.0