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Note 12 - Preferred Stock (Tables)
 9 Months Ended
Sep. 30, 2015
Outstanding Preferred Stock [Member]  
Note 12 - Preferred Stock (Tables) [Line Items]  
Schedule of Stockholders Equity [Table Text Block]

As of September 30, 2015 and December 31, 2014

  

Series of Preferred Stock

  

Shares Authorized

    

Shares Issued and Outstanding

    

Liquidation Preference

(in thousands)

    

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