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])	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
New York [Member]
Concentration Risk [Line Items]
Geographic concentrations	35.60%	35.90%
Massachusetts [Member]
Concentration Risk [Line Items]
Geographic concentrations	24.80%	24.60%
New Jersey [Member]
Concentration Risk [Line Items]
Geographic concentrations	10.80%	10.40%
Florida [Member]
Concentration Risk [Line Items]
Geographic concentrations	6.10%	5.80%
Connecticut [Member]
Concentration Risk [Line Items]
Geographic concentrations	5.90%	5.60%