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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, 2024
Dec. 31, 2023
Jul. 31, 2024
Feb. 29, 2024
Dec. 29, 2023
Aug. 10, 2022
Nov. 30, 2021
Stock Repurchased and Retired During Period, Shares (in shares)   79,354 575,156          
Stock Repurchased and Retired During Period, Value   $ 2,200 $ 17,600          
Proceeds from Issuance of Senior Long-Term Debt   135,252 0          
Proceeds from Issuance of Common Stock   7,074 0          
Senior Notes 2026 [Member]                
Debt Instrument, Interest Rate, Stated Percentage               6.125%
Debt Instrument, Face Amount               $ 150,000
Senior Notes 2026 [Member] | Public Offering [Member]                
Debt Instrument, Interest Rate, Stated Percentage             6.125%  
Proceeds from Issuance of Senior Long-Term Debt   0 0          
Senior Notes 2029 [Member]                
Debt Instrument, Interest Rate, Stated Percentage       9.25%        
Debt Instrument, Face Amount       $ 60,000 $ 57,200      
Senior Notes 2029 [Member] | Public Offering [Member]                
Debt Instrument, Interest Rate, Stated Percentage             9.25%  
Proceeds from Issuance of Senior Long-Term Debt   24,600 0          
Debt Instrument, Face Amount   $ 24,900 $ 0          
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   $ 0 $ 29,000          
Preferred Stock, Dividend Rate, Percentage   7.625%            
Preferred Stock, Liquidation Preference Per Share (in dollars per share)   $ 25            
Preferred Stock, Dividends Per Share, Declared (in dollars per share)   $ 0.48 $ 0.48          
Series B Preferred Stock [Member] | Public Offering [Member]                
Stock Issued During Period, Shares, New Issues (in shares)   44,618 53,727          
Proceeds from Issuance of Preferred Stock and Preference Stock   $ 1,100 $ 1,100          
Series B Preferred Stock [Member] | Maximum [Member]                
Preferred Stock, Aggregate Offering Price             $ 100,000  
Series B Preferred Stock [Member] | O2021A Dividends [Member]                
Preferred Stock, Dividends Per Share, Declared (in dollars per share) $ 1.90625              
Common Shares [Member] | Public Offering [Member]                
Stock Issued During Period, Shares, New Issues (in shares)   125,000 0          
Proceeds from Issuance of Common Stock   $ 7,100