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Note 17 - Preferred Stock, Common Stock and Convertible Unit Transactions (Tables) | 12 Months Ended
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Dec. 31, 2012 Outstanding Preferred Stock [Member] | Dec. 31, 2011 Preferred Stock Issued [Member] | Dec. 31, 2011 Preferred Stock Redeemed [Member]
Schedule of Stockholders Equity [Table Text Block] |
As of December 31, 2012 |
Series of Preferred Stock |  | Shares Authorized |  |  | Shares Issued and Outstanding |  |  | Liquidation Preference |  |  | Dividend Rate |  |  | Annual Dividend per Depositary Share |  |  | Par Value |
Series H |  |  | 70,000 |  |  |  | 70,000 |  |  | $ | 175,000 |  |  |  | 6.90 | % |  | $ | 1.72500 |  |  | $ | 1.00 |
Series I |  |  | 18,400 |  |  |  | 16,000 |  |  |  | 400,000 |  |  |  | 6.00 | % |  | $ | 1.50000 |  |  | $ | 1.00 |
Series J |  |  | 9,000 |  |  |  | 9,000 |  |  |  | 225,000 |  |  |  | 5.50 | % |  | $ | 1.37500 |  |  | $ | 1.00 |
Series K |  |  | 8,050 |  |  |  | 7,000 |  |  |  | 175,000 |  |  |  | 5.625 | % |  | $ | 1.40625 |  |  | $ | 1.00 |
|  |  | 105,450 |  |  |  | 102,000 |  |  | $ | 975,000 |  |  |  |  |  |  |  |  |  |  |  |  |
As of December 31, 2011 |
Series of Preferred Stock |  | Shares Authorized |  |  | Shares Issued and Outstanding |  |  | Liquidation Preference |  |  | Dividend Rate |  |  | Annual Dividend per Depositary Share |  |  | Par Value |
Series F |  |  | 700,000 |  |  |  | 700,000 |  |  | $ | 175,000 |  |  |  | 6.65 | % |  | $ | 1.66250 |  |  | $ | 1.00 |
Series G |  |  | 184,000 |  |  |  | 184,000 |  |  |  | 460,000 |  |  |  | 7.75 | % |  | $ | 1.93750 |  |  | $ | 1.00 |
Series H |  |  | 70,000 |  |  |  | 70,000 |  |  |  | 175,000 |  |  |  | 6.90 | % |  | $ | 1.72500 |  |  | $ | 1.00 |
|  |  | 954,000 |  |  |  | 954,000 |  |  | $ | 810,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Series of Preferred Stock |  | Date Issued |  | Depositary Shares Issued |  | Fractional Interest per Share |  | Net Proceeds, After Expenses (in millions) |  | Offering/ Redemption Price |  | Optional Redemption Date
Series H(1) |  | 8/30/2010 |  | 7,000,000 |  | 1/100 |  | $ | 169.2 |  | $ | 25.00 |  | 8/30/2015
Series I (2) |  | 3/20/2012 |  | 16,000,000 |  | 1/1000 |  | $ | 387.2 |  | $ | 25.00 |  | 3/20/2017
Series J (3) |  | 7/25/2012 |  | 9,000,000 |  | 1/1000 |  | $ | 217.8 |  | $ | 25.00 |  | 7/25/2017
Series K (4) |  | 12/7/2012 |  | 7,000,000 |  | 1/1000 |  | $ | 169.1 |  | $ | 25.00 |  | 12/7/2017
Series of Preferred Stock |  | Date Issued |  | Depositary Shares Issued |  | Redemption Amount (in millions) |  | Offering/ Redemption Price |  | Optional Redemption Date |  | Actual Redemption Date
Series F (1) |  | 6/5/2003 |  | 7,000,000 |  | $ | 175.0 |  | $ | 25.00 |  | 6/5/2008 |  | 8/15/2012
Series G (2) |  | 10/10/2007 |  | 18,400,000 |  | $ | 460.0 |  | $ | 25.00 |  | 10/10/2012 |  | 10/10/2012

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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