Note 2 - Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Note 2 - Summary of Significant Accounting Policies (Details) [Line Items]    
Restricted Cash and Cash Equivalents $ 44.1 $ 46.5
Interest Receivable 30.2 18.3
Deferred Finance Costs, Gross 4.1 2.6
REIT Distribution Percentage 90.00%  
Number of Operating Segments 1  
Undistributed [Member]
   
Note 2 - Summary of Significant Accounting Policies (Details) [Line Items]    
REIT Distribution Percentage 85.00%  
Held in Agency IO Portfolio for Trading Purposes [Member]
   
Note 2 - Summary of Significant Accounting Policies (Details) [Line Items]    
Restricted Cash and Cash Equivalents 30.4 25.8
Held by Counterparties as Collateral for Hedging Instruments [Member]
   
Note 2 - Summary of Significant Accounting Policies (Details) [Line Items]    
Restricted Cash and Cash Equivalents $ 10.2 $ 19.8