Note 9 - Financing Arrangements, Portfolio Investments (Tables)
12 Months Ended
Dec. 31, 2013
Disclosure Text Block [Abstract]  
Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block]
   

2013

   

2012

 
   

Outstanding Repurchase Agreements

   

Fair Value of Collateral Pledged

   

Amortized Cost

Of Collateral

Pledged

   

Outstanding Repurchase Agreements

   

Fair Value of Collateral Pledged

   

Amortized Cost

Of Collateral

Pledged

 

Agency RMBS

                                               

Agency ARMs

  $ 197,974     $ 208,703     $ 214,039     $ 240,440     $ 253,841     $ 253,281  

Agency Fixed Rate

    489,953       516,010       541,580       566,037       597,620       597,769  

Agency IOs

    94,698       113,721       122,878       74,707       90,250       100,076  

CLOs

    8,500       14,789       8,947       7,950       12,945       6,877  

Balance at end of the period

  $ 791,125     $ 853,223     $ 887,444     $ 889,134     $ 954,656     $ 958,003  
Outstanding Repurchase Agreements by Contractual Maturity [Table Text Block]

Contractual Maturity

 

December 31,

2013

   

December 31,

2012

 

Within 30 days

  $ 509,564     $ 765,593  

Over 30 days to 90 days

    281,561       123,541  

Total

  $ 791,125     $ 889,134