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Note 10 - Redeemable, Convertible Preferred Stock - Schedule of Redeemable, Convertible Preferred Stock (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Redeemable, convertible preferred stock $ 203 $ 196
Series B Preferred Stock [Member]    
Redeemable, convertible preferred stock 95 94
Series C Preferred Stock [Member]    
Redeemable, convertible preferred stock $ 108 $ 102