Note 15 - Summary of Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share Basic [Line Items]
Net income (loss)	$ 16	$ 6	$ (5)	$ (111)	$ 22	$ (116)
Net income (loss) available to common shareholders - basic	13		(10)		26	(126)
Effect of dilutive securities:
Net income (loss) available to common shareholders - diluted	$ 16		$ (10)		$ 30	$ (126)
Basic	78.5		43.7		78.2	43.7
Effect of dilutive securities
Weighted average shares — diluted	100.6		43.7		93.9	43.7
Series B Preferred Stock [Member]
Effect of dilutive securities
Effect of dilutive securities	9.5				6.5
Series C Preferred Stock [Member]
Effect of dilutive securities
Effect of dilutive securities	10.0				6.4
Employee Stock Option [Member]
Effect of dilutive securities
Effect of dilutive securities	2.0				2.2
Unvested Restricted Stock Units [Member]
Effect of dilutive securities
Effect of dilutive securities	0.6				0.6
Series B Preferred Stock [Member]
Earnings Per Share Basic [Line Items]
Less: preferred stock cash and deemed dividends	$ (1)				$ (2)
Effect of dilutive securities:
Add back: preferred stock cash and deemed dividends	1				2
Series C Preferred Stock [Member]
Earnings Per Share Basic [Line Items]
Less: preferred stock in-kind and deemed dividends	(2)				(2)
Effect of dilutive securities:
Add back: preferred stock cash and deemed dividends	$ 2				2
Series A Preferred Stock [Member]
Earnings Per Share Basic [Line Items]
Less: preferred stock cash and deemed dividends			$ (5)		(3)	$ (10)
Plus: Expiration of Series A preferred stock embedded derivative					11
Effect of dilutive securities:
Add back: preferred stock cash and deemed dividends			$ 5		$ 3	$ 10