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Note 19 - Preferred Stock, Common Stock and Convertible Unit Transactions - Outstanding Preferred Stock (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Preferred stock, shares authorized (in shares) 7,054,000 7,054,000
Preferred stock, liquidation preference $ 485,868 $ 489,500
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) 8,946 9,000
Preferred stock, liquidation preference $ 223,637,000 $ 225,000,000
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) 10,489 10,580
Preferred stock, liquidation preference $ 262,231,000 $ 264,500,000
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) 19,435 19,580
Preferred stock, liquidation preference $ 485,868,000 $ 489,500,000