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Note 4 - Shareholders' Equity and Preferred Stock (Details Textual) - USD ($)
 2 Months Ended 3 Months Ended 6 Months Ended
Dec. 27, 2019
Jul. 31, 2021
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 29, 2023
Aug. 10, 2022
Stock Repurchased and Retired During Period, Shares (in shares)     49,203 105,447 67,236 177,801    
Stock Repurchased and Retired During Period, Value     $ 1,300,000 $ 3,000,000 $ 1,800,000 $ 4,900,000    
Proceeds from Issuance of Senior Long-Term Debt         54,559,000 0    
Maximum [Member]                
Common Stock Aggregate Offering Price             $ 50,000,000  
Public Offering [Member] | Senior Notes 2026 [Member]                
Proceeds from Issuance of Senior Long-Term Debt     $ 0 $ 0 $ 0 $ 0    
Series B Preferred Stock [Member]                
Stock Repurchased and Retired During Period, Shares (in shares)     0 0 0 1,806    
Stock Repurchased and Retired During Period, Value       $ 0   $ 29,000    
Series B Preferred Stock [Member] | Maximum [Member]                
Preferred Stock, Aggregate Offering Price               $ 100,000,000
Series B Preferred Stock [Member] | O2021A Dividends [Member]                
Preferred Stock, Dividends Per Share, Declared (in dollars per share)   $ 1.90625            
Series B Preferred Stock [Member] | Public Offering [Member]                
Stock Issued During Period, Shares, New Issues (in shares)   3,188,533 0 2,100 44,143 53,427    
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   $ 76,500,000 $ 0 $ 0 $ 1,100,000 $ 1,100,000    
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   0