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Note 13 - Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2018
Notes Tables |
Schedule of Stockholders Equity [Table Text Block] |
As of September 30 , 2018
Class of Preferred Stock |  | Shares Authorized |  |  | Shares Issued and Outstanding |  |  | Liquidation Preference (in thousands) |  |  | Dividend Rate |  |  | Annual Dividend per Depositary Share |  |  | Par Value |  | Optional Redemption Date
Class I |  |  | 18,400 |  |  |  | 7,000 |  |  | $ | 175,000 |  |  |  | 6.000 | % |  | $ | 1.50000 |  |  | $ | 1.00 |  | 3/20/2017
Class J |  |  | 9,000 |  |  |  | 9,000 |  |  | $ | 225,000 |  |  |  | 5.500 | % |  | $ | 1.37500 |  |  | $ | 1.00 |  | 7/25/2017
Class K |  |  | 8,050 |  |  |  | 7,000 |  |  | $ | 175,000 |  |  |  | 5.625 | % |  | $ | 1.40625 |  |  | $ | 1.00 |  | 12/7/2017
Class L |  |  | 10,350 |  |  |  | 9,000 |  |  | $ | 225,000 |  |  |  | 5.125 | % |  | $ | 1.28125 |  |  | $ | 1.00 |  | 8/16/2022
Class M (1) |  |  | 10,580 |  |  |  | 10,580 |  |  | $ | 264,500 |  |  |  | 5.250 | % |  | $ | 1.31250 |  |  | $ | 1.00 |  | 12/20/2022
|  |  |  |  |  |  | 42,580 |  |  | $ | 1,064,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
As of December 31, 2017
Class of Preferred Stock |  | Shares Authorized |  |  | Shares Issued and Outstanding |  |  | Liquidation Preference (in thousands) |  |  | Dividend Rate |  |  | Annual Dividend per Depositary Share |  |  | Par Value |  | Optional Redemption Date
Class I |  |  | 18,400 |  |  |  | 7,000 |  |  | $ | 175,000 |  |  |  | 6.000 | % |  | $ | 1.50000 |  |  | $ | 1.00 |  | 3/20/2017
Class J |  |  | 9,000 |  |  |  | 9,000 |  |  | $ | 225,000 |  |  |  | 5.500 | % |  | $ | 1.37500 |  |  | $ | 1.00 |  | 7/25/2017
Class K |  |  | 8,050 |  |  |  | 7,000 |  |  | $ | 175,000 |  |  |  | 5.625 | % |  | $ | 1.40625 |  |  | $ | 1.00 |  | 12/7/2017
Class L |  |  | 10,350 |  |  |  | 9,000 |  |  | $ | 225,000 |  |  |  | 5.125 | % |  | $ | 1.28125 |  |  | $ | 1.00 |  | 8/16/2022
Class M |  |  | 10,580 |  |  |  | 9,200 |  |  | $ | 230,000 |  |  |  | 5.250 | % |  | $ | 1.31250 |  |  | $ | 1.00 |  | 12/20/2022
|  |  |  |  |  |  | 41,200 |  |  | $ | 1,030,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Declared [Table Text Block] |
|  | Nine Months Ended September 30, |
|  | 2018 |  |  | 2017 |
Common Shares |  | $ | 0.84000 |  |  | $ | 0.81000 |
Class I Depositary Shares |  | $ | 1.12500 |  |  | $ | 1.12500 |
Class I Depositary Shares Redeemed |  | $ | - |  |  | $ | 0.96250 |
Class J Depositary Shares |  | $ | 1.03125 |  |  | $ | 1.03125 |
Class K Depositary Shares |  | $ | 1.05468 |  |  | $ | 1.05468 |
Class L Depositary Shares |  | $ | 0.96093 |  |  | $ | 0.16016 |
Class M Depositary Shares |  | $ | 0.98439 |  |  | $ | - |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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