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Note 9 - Stock Compensation (Details Textual) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid     $ 1  
Stock Compensation Credit $ 1      
Share-based Payment Arrangement, Expense   $ 5 $ 3 $ 10
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 24   $ 24
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       2 years 1 month 6 days
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares)     0.5  
Performance Share Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares)     0.3