Note 14 - Earnings Per Share (Details Textual) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Two Thousand Twenty One Convertible Notes [Member]
Antidilutive Securities Excluded From Computation of Earnings Per Share, Amount, Value		$ 25		$ 25
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)			0.1
Dilutive Securities Excluded In Computation Of Earnings Per Share Amount (in shares)	1.2	0.7
Share-Based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	3.1	3.3	3.9	3.4
Dilutive Securities Excluded In Computation Of Earnings Per Share Amount (in shares)		1.3
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	1.0		1.0