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Note 11 - Marketable Securities - Schedule of Marketable Securities (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Equity Securities, Cost $ 0 $ 16
Equity Securities, Unrealized Gain   33
Equity Securities, Fair Value 0 49
Total Current Marketable Securities, Cost 18 21
Total current marketable securities, Unrealized Gain 0 0
Total current marketable securities, Fair Value 18 21
Certificates of Deposit [Member]    
Debt Securities, Cost 18 21
Debt Securities, Unrealized Gain 0 0
Debt Securities, Fair Value 18 21
Common Stock [Member]    
Equity Securities, Cost 0 0
Equity Securities, Unrealized Gain 0 0
Equity Securities, Fair Value $ 0 $ 0