Note 1 - Organization and Summary of Significant Accounting Policies - Effect of Error Correction on Financial Statements (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Net income	$ 68	$ 38
Less: Noncontrolling interests net income	1	2
Less: Redeemable noncontrolling interests net loss	(4)	(22)
Net income attributable to the parent company	$ 71	$ 58
Basic (in dollars per share)	$ 0.49	$ 0.40
Diluted (in dollars per share)	$ 0.48	$ 0.40
Total comprehensive loss	$ 49	$ (84)
Less: Comprehensive loss attributable to noncontrolling interests	1	17
Less: Comprehensive (income) loss attributable to redeemable noncontrolling interests	3	14
Comprehensive income (loss) attributable to the parent company	53	(53)
Redeemable noncontrolling interests	182	155	$ 180
Retained earnings	$ 583	664	$ 530
Previously Reported [Member]
Net income		38
Less: Noncontrolling interests net income		2
Less: Redeemable noncontrolling interests net loss		(2)
Net income attributable to the parent company		$ 38
Basic (in dollars per share)		$ 0.26
Diluted (in dollars per share)		$ 0.26
Total comprehensive loss		$ (84)
Less: Comprehensive loss attributable to noncontrolling interests		17
Less: Comprehensive (income) loss attributable to redeemable noncontrolling interests		(6)
Comprehensive income (loss) attributable to the parent company		(73)
Redeemable noncontrolling interests		175
Retained earnings		644
Revision of Prior Period, Adjustment [Member]
Net income		0
Less: Noncontrolling interests net income
Less: Redeemable noncontrolling interests net loss		(20)
Net income attributable to the parent company		$ 20
Basic (in dollars per share)		$ 0.14
Diluted (in dollars per share)		$ 0.14
Total comprehensive loss		$ 0
Less: Comprehensive loss attributable to noncontrolling interests
Less: Comprehensive (income) loss attributable to redeemable noncontrolling interests		20
Comprehensive income (loss) attributable to the parent company		20
Redeemable noncontrolling interests		(20)
Retained earnings		$ 20