Note 6 - Consolidated K-Series (Details) - Condensed Statement Of Operations Of The Consolidated K-Series (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Condensed Income Statements, Captions [Line Items]      
Interest expense $ 231,178 $ 105,926 $ 4,837
Net interest income 60,549 31,422 19,454
Unrealized gain on multi-family loans and debt held in securitization trusts 31,495 6,662  
Consolidated K-Series [Member]
     
Condensed Income Statements, Captions [Line Items]      
Interest income 228,631 104,410  
Interest expense 210,229 97,032  
Net interest income 18,402 7,378  
Unrealized gain on multi-family loans and debt held in securitization trusts 31,495 6,662  
Net Income $ 49,897 $ 14,040