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Note 4 - Shareholders' Equity and Preferred Stock (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 2 Months Ended 12 Months Ended
Jul. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 29, 2023
Aug. 10, 2022
Stock Repurchased and Retired During Period, Shares (in shares)   575,156 1,674,161    
Stock Repurchased and Retired During Period, Value   $ 17,600 $ 88,900    
Maximum [Member]          
Common Stock Aggregate Offering Price       $ 50,000  
Series B Preferred Stock [Member]          
Stock Repurchased and Retired During Period, Shares (in shares)   1,806 3,500    
Stock Repurchased and Retired During Period, Value   $ 29,000 $ 69,000    
Series B Preferred Stock [Member] | Maximum [Member]          
Preferred Stock, Aggregate Offering Price         $ 100,000
Series B Preferred Stock [Member] | Public Offering [Member]          
Stock Issued During Period, Shares, New Issues (in shares) 3,188,533 53,727 19,607    
Preferred Stock, Dividend Rate, Percentage 7.625%        
Preferred Stock, Liquidation Preference Per Share (in dollars per share) $ 25        
Proceeds from Issuance of Preferred Stock and Preference Stock $ 76,500 $ 1,100 $ 400    
Preferred Stock, Dividends Per Share, Declared (in dollars per share) $ 1.90625        
Common Shares [Member] | Public Offering [Member]          
Proceeds from Issuance of Common Stock   $ 0