Note 5 - Loans Acquired (Details) - Summary of the Changes in the FDIC True-Up Provision (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of the Changes in the FDIC True-Up Provision [Abstract]
Balance	$ 6,768	$ 4,854	$ 3,419
FDIC true-up provision recorded on new acquisitions			328
Amortization expense	168	160	138
Adjustments related to changes in expected losses	1,372	1,754	969
Balance	$ 8,308	$ 6,768	$ 4,854