Note 18 - Concentration of Third-Party Mortgage Purchasers (Details) - Percent of Mortgage Loans Sold to Third-Party Purchasers (Customer Concentration Risk [Member])	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Wells Fargo Funding Inc [Member]
Concentration Risk [Line Items]
Customer	37.00%	40.00%	58.00%
PennyMac Loan Services, LLC [Member]
Concentration Risk [Line Items]
Customer	23.00%	7.00%	0.00%
JP Morgan Chase Bank NA [Member]
Concentration Risk [Line Items]
Customer	20.00%	46.00%	36.00%
Fannie Mae [Member]
Concentration Risk [Line Items]
Customer	10.00%	4.00%	4.00%