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Note 24 - Income Taxes - Taxable Characteristics of Distributions Paid (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Dividends distributed, amount | $ 380,316 | $ 377,651 | $ 528,606
Series I Preferred Stock [Member] |  |  |
Ordinary income, amount | $ 0 | $ 0 | $ 7,389
Ordinary income, percent | 0.00% | 0.00% | 77.00%
Capital gain, amount | $ 0 | $ 0 | $ 2,207
Capital gain, percent | 0.00% | 0.00% | 23.00%
Dividends distributed, amount | $ 0 | $ 0 | $ 9,596
Dividends distributed, percent | 0.00% | 0.00% | 100.00%
Series J Preferred Stock [Member] |  |  |
Ordinary income, amount | $ 0 | $ 0 | $ 11,541
Ordinary income, percent | 0.00% | 0.00% | 77.00%
Capital gain, amount | $ 0 | $ 0 | $ 3,447
Capital gain, percent | 0.00% | 0.00% | 23.00%
Dividends distributed, amount | $ 0 | $ 0 | $ 14,988
Dividends distributed, percent | 0.00% | 0.00% | 100.00%
Series K Preferred Stock [Member] |  |  |
Ordinary income, amount | $ 0 | $ 0 | $ 6,927
Ordinary income, percent | 0.00% | 0.00% | 77.00%
Capital gain, amount | $ 0 | $ 0 | $ 2,069
Capital gain, percent | 0.00% | 0.00% | 23.00%
Dividends distributed, amount | $ 0 | $ 0 | $ 8,996
Dividends distributed, percent | 0.00% | 0.00% | 100.00%
Series L Preferred Stock [Member] |  |  |
Ordinary income, amount | $ 11,185 | $ 4,382 | $ 8,879
Ordinary income, percent | 97.00% | 38.00% | 77.00%
Capital gain, amount | $ 346 | $ 7,149 | $ 2,652
Capital gain, percent | 3.00% | 62.00% | 23.00%
Dividends distributed, amount | $ 11,531 | $ 11,531 | $ 11,531
Dividends distributed, percent | 100.00% | 100.00% | 100.00%
Series M Preferred Stock [Member] |  |  |
Ordinary income, amount | $ 13,469 | $ 5,277 | $ 10,692
Ordinary income, percent | 97.00% | 38.00% | 77.00%
Capital gain, amount | $ 417 | $ 8,609 | $ 3,194
Capital gain, percent | 3.00% | 62.00% | 23.00%
Dividends distributed, amount | $ 13,886 | $ 13,886 | $ 13,886
Dividends distributed, percent | 100.00% | 100.00% | 100.00%
Common Stock 1 [Member] |  |  |
Ordinary income, amount | $ 273,272 | $ 133,849 | $ 328,726
Ordinary income, percent | 77.00% | 38.00% | 70.00%
Capital gain, amount | $ 10,647 | $ 214,863 | $ 98,618
Capital gain, percent | 3.00% | 61.00% | 21.00%
Dividends distributed, amount | $ 354,899 | $ 352,234 | $ 469,609
Dividends distributed, percent | 100.00% | 100.00% | 100.00%
Return of capital, amount | $ 70,980 | $ 3,522 | $ 42,265
Return of capital, percent | 20.00% | 1.00% | 9.00%

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