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Note 22 - Income Taxes - Taxable Characteristics of Distributions Paid (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dividends distributed, amount $ 471,850 $ 454,036 $ 426,344
Dividends distributed, percent
Series H Preferred Stock [Member]      
Ordinary income, amount $ 6,762
Ordinary income, percent 56.00%
Capital gain, amount $ 13,417 $ 5,313
Capital gain, percent 100.00% 44.00%
Dividends distributed, amount $ 13,417 $ 12,075
Dividends distributed, percent 100.00% 100.00%
Series I Preferred Stock [Member]      
Ordinary income, amount $ 16,320 $ 13,440
Ordinary income, percent 68.00% 56.00%
Capital gain, amount $ 7,680 $ 24,000 $ 10,560
Capital gain, percent 32.00% 100.00% 44.00%
Dividends distributed, amount $ 24,000 $ 24,000 $ 24,000
Dividends distributed, percent 100.00% 100.00% 100.00%
Series J Preferred Stock [Member]      
Ordinary income, amount $ 8,415 $ 6,930
Ordinary income, percent 68.00% 56.00%
Capital gain, amount $ 3,960 $ 12,375 $ 5,445
Capital gain, percent 32.00% 100.00% 44.00%
Dividends distributed, amount $ 12,375 $ 12,375 $ 12,375
Dividends distributed, percent 100.00% 100.00% 100.00%
Series K Preferred Stock [Member]      
Ordinary income, amount $ 6,694 $ 5,513
Ordinary income, percent 68.00% 56.00%
Capital gain, amount $ 3,150 $ 9,844 $ 4,331
Capital gain, percent 32.00% 100.00% 44.00%
Dividends distributed, amount $ 9,844 $ 9,844 $ 9,844
Dividends distributed, percent 100.00% 100.00% 100.00%
Common Stock 1 [Member]      
Ordinary income, amount $ 263,892 $ 132,498
Ordinary income, percent 62.00% 36.00%
Capital gain, amount $ 127,689 $ 394,400 $ 103,054
Capital gain, percent 30.00% 100.00% 28.00%
Dividends distributed, amount $ 425,631 $ 394,400 $ 368,050
Dividends distributed, percent 100.00% 100.00% 100.00%
Return of capital, amount $ 34,050 $ 132,498
Return of capital, percent 8.00% 36.00%