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Note 13 - Stockholders' Equity - Dividends Declared Per Share (Details) - $ / shares | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Common Shares (in dollars per share) | $ 0.84 | $ 0.81
Series I Preferred Stock [Member] |  |
Depositary Shares (in dollars per share) | 1.125 | 1.125
Series I Preferred Stock Redeemed [Member] |  |
Depositary Shares (in dollars per share) |  | 0.9625
Series J Preferred Stock [Member] |  |
Depositary Shares (in dollars per share) | 1.03125 | 1.03125
Series K Preferred Stock [Member] |  |
Depositary Shares (in dollars per share) | 1.05468 | 1.05468
Series L Preferred Stock [Member] |  |
Depositary Shares (in dollars per share) | 0.96093 | 0.16016
Series M Preferred Stock [Member] |  |
Depositary Shares (in dollars per share) | $ 0.98439 |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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