Note 4 - Residential Mortgage Loans Held in Securitization Trusts (Net) and Real Estate Owned (Details) - Geographic Concentrations of Credit Risk (Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization [Member])
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
New York [Member]
   
Concentration Risk [Line Items]    
Geographic concentrations 35.90% 37.80%
Massachusetts [Member]
   
Concentration Risk [Line Items]    
Geographic concentrations 24.60% 25.20%
New Jersey [Member]
   
Concentration Risk [Line Items]    
Geographic concentrations 10.40% 9.50%
Florida [Member]
   
Concentration Risk [Line Items]    
Geographic concentrations 5.80% 5.10%
Connecticut [Member}
   
Concentration Risk [Line Items]    
Geographic concentrations 5.60% 5.00%