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Note 16 - Preferred Stock, Common Stock and Convertible Unit Transactions - Dividends Declared (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Common Stock (in dollars per share) | $ 1.12 | $ 1.09 | $ 1.035
Series I Preferred Stock [Member] |  |  |
Preferred Shares (in dollars per share) | 1.50 | 1.50 | 1.50
Series I Preferred Stock Redeemed [Member] |  |  |
Preferred Shares (in dollars per share) |  | 0.9625 |
Series J Preferred Stock [Member] |  |  |
Preferred Shares (in dollars per share) | 1.375 | 1.375 | 1.375
Series K Preferred Stock [Member] |  |  |
Preferred Shares (in dollars per share) | 1.40625 | 1.40625 | 1.40625
Series L Preferred Stock [Member] |  |  |
Preferred Shares (in dollars per share) | 1.28125 | 0.48047 |
Series M Preferred Stock [Member] |  |  |
Preferred Shares (in dollars per share) | $ 1.3125 | $ 0.0401 |

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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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