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Note 4 - Convertible Securities and Credit Facilities - Schedule of Redeemable, Convertible Preferred Stock (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Redeemable, convertible preferred stock $ 205 $ 203
Series B Preferred Stock [Member]    
Redeemable, convertible preferred stock 96 95
Series C Preferred Stock [Member]    
Redeemable, convertible preferred stock $ 109 $ 108