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Note 4 - Shareholders' Equity and Preferred Stock (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 2 Months Ended 3 Months Ended
Dec. 27, 2019
Jul. 31, 2021
Mar. 31, 2024
Mar. 31, 2023
Dec. 29, 2023
Aug. 10, 2022
Stock Repurchased and Retired During Period, Shares (in shares)     18,033 72,354    
Stock Repurchased and Retired During Period, Value     $ 500 $ 1,900    
Maximum [Member]            
Common Stock Aggregate Offering Price         $ 50,000  
Series B Preferred Stock [Member]            
Stock Repurchased and Retired During Period, Shares (in shares)     0 1,806    
Stock Repurchased and Retired During Period, Value       $ 29,000    
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 44,143 51,327    
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 $ 1,100    
Preferred Stock, Dividends Per Share, Declared (in dollars per share)   $ 1.90625        
Series A Preferred Stock [Member]            
Preferred Stock, Dividend Rate, Percentage 6.00%          
Series A Preferred Stock [Member] | Public Offering [Member]            
Preferred Stock, Dividend Rate, Percentage   6.00%        
Preferred Stock, Liquidation Preference Per Share (in dollars per share)   $ 100        
Common Shares [Member] | Public Offering [Member]            
Stock Issued During Period, Shares, New Issues (in shares)     0      
Proceeds from Issuance of Common Stock     $ 0