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Note 6 - Investments Investments Trading Securities (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading Securities $ 3,963,465,000 $ 4,094,622,000
Securities (Assets)
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading Securities, Change in Unrealized Holding (Loss) Gain (10,500,000) 29,800,000
US government and agency securities
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading Securities 461,797,000 428,519,000
State and municipal obligations
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading Securities 670,385,000 669,975,000
Corporate bonds and notes
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading Securities 1,437,828,000 1,357,175,000
RMBS
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading Securities 599,471,000 663,307,000
CMBS
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading Securities 299,210,000 237,294,000
Other ABS
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading Securities 221,641,000 254,102,000
Foreign government securities
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading Securities 0 [1] 117,686,000 [1]
Hybrid Instrument [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading Securities 144,012,000 211,944,000
Equity securities
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading Securities 128,217,000 153,722,000
Other investments
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading Securities $ 904,000 $ 898,000
[1] As of March 31, 2013, there were no foreign government securities in our investment portfolio. We sold our investment in foreign government securities during the first quarter of 2013, as our market view of these investments changed, and their performance did not meet our expectations.