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Note 15 - Stockholders' Equity - Outstanding Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Preferred stock, shares authorized (in shares) 7,054,000 7,054,000  
Preferred stock, liquidation preference $ 485,536 $ 489,868  
Preferred stock, par value (in dollars per share) $ 1.00 $ 1.00  
Series L Preferred Stock [Member]      
Preferred stock, shares authorized (in shares) 10,350 10,350  
Shares issued and outstanding (in shares) 8,940 8,946  
Preferred stock, liquidation preference $ 223,499 $ 223,637  
Dividend rate 5.125% 5.125%  
Annual dividend per depository share (in dollars per share) $ 1.28125 $ 1.28125  
Preferred stock, par value (in dollars per share)   $ 1.00 $ 1.00
Series M Preferred Stock [Member]      
Preferred stock, shares authorized (in shares) 10,580 10,580  
Shares issued and outstanding (in shares) 10,481 10,489  
Preferred stock, liquidation preference $ 262,037 $ 262,231  
Dividend rate 5.25% 5.25%  
Annual dividend per depository share (in dollars per share) $ 1.31250 $ 1.31250  
Preferred stock, par value (in dollars per share)   $ 1.00 $ 1.00
Redeemable Preferred Stock [Member]      
Shares issued and outstanding (in shares) 19,421 19,435  
Preferred stock, liquidation preference $ 485,536 $ 485,868