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Note 8 - Stock Compensation (Details Textual) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Share-Based Payment Arrangement, Expense $ 6 $ 4
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 44  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 2 years 2 months 12 days  
Performance Share Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years  
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 4.28%  
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate 2.50%  
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate 67.00%  
Restricted Stock Units (RSUs) [Member]    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Share-Based Liabilities Paid $ 5  
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) 1.2