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Note 22 - Income Taxes - Taxable Characteristics of Distributions Paid (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Dividends distributed, amount | $ 377,651 | $ 528,606 | $ 526,912
Series I Preferred Stock [Member] |  |  |
Ordinary income, amount | $ 0 | $ 7,389 | $ 5,565
Ordinary income, percent | 0.00% | 77.00% | 53.00%
Capital gain, amount | $ 0 | $ 2,207 | $ 4,935
Capital gain, percent | 0.00% | 23.00% | 47.00%
Dividends distributed, amount | $ 0 | $ 9,596 | $ 10,500
Dividends distributed, percent | 0.00% | 100.00% | 100.00%
Series J Preferred Stock [Member] |  |  |
Ordinary income, amount | $ 0 | $ 11,541 | $ 6,559
Ordinary income, percent | 0.00% | 77.00% | 53.00%
Capital gain, amount | $ 0 | $ 3,447 | $ 5,816
Capital gain, percent | 0.00% | 23.00% | 47.00%
Dividends distributed, amount | $ 0 | $ 14,988 | $ 12,375
Dividends distributed, percent | 0.00% | 100.00% | 100.00%
Series K Preferred Stock [Member] |  |  |
Ordinary income, amount | $ 0 | $ 6,927 | $ 5,217
Ordinary income, percent | 0.00% | 77.00% | 53.00%
Capital gain, amount | $ 0 | $ 2,069 | $ 4,627
Capital gain, percent | 0.00% | 23.00% | 47.00%
Dividends distributed, amount | $ 0 | $ 8,996 | $ 9,844
Dividends distributed, percent | 0.00% | 100.00% | 100.00%
Series L Preferred Stock [Member] |  |  |
Ordinary income, amount | $ 4,382 | $ 8,879 | $ 6,111
Ordinary income, percent | 38.00% | 77.00% | 53.00%
Capital gain, amount | $ 7,149 | $ 2,652 | $ 5,420
Capital gain, percent | 62.00% | 23.00% | 47.00%
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 | $ 5,277 | $ 10,692 | $ 6,031
Ordinary income, percent | 38.00% | 77.00% | 53.00%
Capital gain, amount | $ 8,609 | $ 3,194 | $ 5,348
Capital gain, percent | 62.00% | 23.00% | 47.00%
Dividends distributed, amount | $ 13,886 | $ 13,886 | $ 11,379
Dividends distributed, percent | 100.00% | 100.00% | 100.00%
Common Stock 1 [Member] |  |  |
Ordinary income, amount | $ 133,849 | $ 328,726 | $ 235,642
Ordinary income, percent | 38.00% | 70.00% | 50.00%
Capital gain, amount | $ 214,863 | $ 98,618 | $ 212,077
Capital gain, percent | 61.00% | 21.00% | 45.00%
Dividends distributed, amount | $ 352,234 | $ 469,609 | $ 471,283
Dividends distributed, percent | 100.00% | 100.00% | 100.00%
Return of capital, amount | $ 3,522 | $ 42,265 | $ 23,564
Return of capital, percent | 1.00% | 9.00% | 5.00%

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