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Note 7 - Redeemable, Convertible Preferred Stock - Schedule of Redeemable, Convertible Preferred Stock (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
6.0% Series B Preferred Stock [Member]    
Redeemable, convertible preferred stock $ 72 $ 0
4.0% Series B Preferred Stock [Member]    
Redeemable, convertible preferred stock $ 0 $ 99