Note 11 - Marketable Securities - Schedule of Marketable Securities (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Equity Securities, Cost	$ 0	$ 0	$ 16
Equity Securities, Unrealized Gain	3	(14)	33
Equity Securities, Fair Value	0	0	49
Total Current Marketable Securities, Cost	40	40	21
Total current marketable securities, Unrealized Gain	19	19	0
Total current marketable securities, Fair Value	59	59	21
Certificates of Deposit [Member]
Debt Securities, Cost	24	24	21
Debt Securities, Unrealized Gain	0	0	0
Debt Securities, Fair Value	24	24	21
Common Stock [Member]
Equity Securities, Cost	16	16	0
Equity Securities, Unrealized Gain		19	0
Equity Securities, Fair Value	$ 35	$ 35	$ 0