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Note 16 - Preferred Stock, Common Stock and Convertible Unit Transactions - Outstanding Preferred Stock (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Shares authorized (in shares) 5,996,240 6,029,100
Liquidation preference $ 1,030,000,000 $ 800,000,000
Preferred Stock, Par or Stated Value Per Share $ 1 $ 1
Series I Preferred Stock [Member]    
Shares authorized (in shares) 18,400 18,400
Shares issued and outstanding (in shares) 7,000 16,000
Liquidation preference $ 175,000 $ 400,000,000
Preferred Stock, Dividend Rate, Percentage 6.00% 6.00%
Annual dividend per depository share (in dollars per share) $ 1.50 $ 1.50
Preferred Stock, Par or Stated Value Per Share $ 1 $ 1
Series J Preferred Stock [Member]    
Shares authorized (in shares) 9,000 9,000
Shares issued and outstanding (in shares) 9,000 9,000
Liquidation preference $ 225,000 $ 225,000,000
Preferred Stock, Dividend Rate, Percentage 5.50% 5.50%
Annual dividend per depository share (in dollars per share) $ 1.375 $ 1.375
Preferred Stock, Par or Stated Value Per Share $ 1 $ 1
Series K Preferred Stock [Member]    
Shares authorized (in shares) 8,050 8,050
Shares issued and outstanding (in shares) 7,000 7,000
Liquidation preference $ 175,000 $ 175,000,000
Preferred Stock, Dividend Rate, Percentage 5.625% 5.625%
Annual dividend per depository share (in dollars per share) $ 1.40625 $ 1.40625
Preferred Stock, Par or Stated Value Per Share $ 1 $ 1
Series L Preferred Stock [Member]    
Shares authorized (in shares) 10,350  
Shares issued and outstanding (in shares) 9,000  
Liquidation preference $ 225,000  
Preferred Stock, Dividend Rate, Percentage 5.125%  
Annual dividend per depository share (in dollars per share) $ 1.28125  
Preferred Stock, Par or Stated Value Per Share $ 1  
Total [Member]    
Shares issued and outstanding (in shares) 41,200 32,000
Liquidation preference $ 1,030,000 $ 800,000,000
Series M Preferred Stock [Member]    
Shares authorized (in shares) 10,580  
Shares issued and outstanding (in shares) 9,200  
Liquidation preference $ 230,000  
Preferred Stock, Dividend Rate, Percentage 5.25%  
Annual dividend per depository share (in dollars per share) $ 1.3125  
Preferred Stock, Par or Stated Value Per Share $ 1