v3.26.1
Note 7 - Preferred Stock (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) 650,000 650,000   650,000   650,000
Payments for Repurchase of Redeemable Preferred Stock       $ 30 $ (0)  
Temporary Equity, Liquidation Preference $ 650 $ 650   650   $ 600
Payments for Repurchase of Redeemable Preferred Stock   $ 20 $ 0 $ 20 $ 0  
2033 Notes [Member]            
Proceeds from Issuance of Debt $ 70          
Series A Perpetual Preferred Stock [Member]            
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) 600,000 600,000   600,000   650,000
Preferred Stock, Liquidation Preference Per Share (in dollars per share) $ 1,000 $ 1,000   $ 1,000   $ 1,000
Payments for Repurchase of Redeemable Preferred Stock $ 30          
Stock Repurchased During Period, Shares (in shares) 50,000          
Temporary Equity, Liquidation Preference $ 50 $ 50   $ 50    
Payments for Repurchase of Redeemable Preferred Stock       $ 20    
Preferred Stock, Dividend Rate, Cash, Percentage       8.00%   8.00%
Preferred Stock, Dividend Rate, Additional Preferred Stock, Percentage       8.50%   8.50%