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Note 3 - Stock-based Compensation (Details Textual)
shares in Thousands, $ in Millions
9 Months Ended
Sep. 30, 2023
USD ($)
shares
Share-Based Payment Arrangement, Option [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) 10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years
Share-based Compensation Arrangement by Share-based Payment Award, Conditions (in shares) | shares 0
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 20
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 1 year 3 months 18 days
Retention Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 4 years
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 98
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 1 year 7 months 6 days
Performance Retention Awards [Member]  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 16
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 1 year 1 month 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period (Month) 37 months
Share-based Compensation Arrangement by Share-based Payment Award, Performance Period (Year) 3 years