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Note 4 - Shareholders' Equity and Preferred Stock (Details Textual) - USD ($)
 2 Months Ended 12 Months Ended
Jul. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Stock Repurchased and Retired During Period, Shares (in shares)   1,674,161 434,381 245,534
Stock Repurchased and Retired During Period, Value   $ 88,939,000 $ 25,219,000 $ 3,353,000
Own-share Lending Arrangement, Shares, Outstanding (in shares)     1,459,233  
Series B Preferred Stock [Member]        
Stock Repurchased and Retired During Period, Shares (in shares)   3,500    
Stock Repurchased and Retired During Period, Value   $ 69,000    
Series B Preferred Stock [Member] | Public Offering [Member]        
Stock Issued During Period, Shares, New Issues (in shares) 3,188,533 19,607    
Preferred Stock, Dividend Rate, Percentage 7.625%      
Preferred Stock, Liquidation Preference Per Share (in dollars per share) $ 25.00      
Proceeds from Issuance of Preferred Stock and Preference Stock $ 76,500,000 $ 400,000    
Preferred Stock, Dividends Per Share, Declared (in dollars per share) $ 1.90625