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Note 16 - Preferred Stock, Common Stock and Convertible Unit Transactions - Preferred Stock Issued (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net Proceeds, After Expenses $ 286,421 $ 493
Series L Preferred Stock [Member]      
Depositary Shares Issued (in shares) 9,000,000    
Net Proceeds, After Expenses $ 218,100    
Offering/ Redemption Price (in dollars per share) $ 25    
Series M Preferred Stock [Member]      
Depositary Shares Issued (in shares) 9,200,000    
Net Proceeds, After Expenses $ 222,800    
Offering/ Redemption Price (in dollars per share) $ 25