Note 5 - Loans Acquired (Details) - Summary of the Changes in the FDIC True-Up Provision - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summary of the Changes in the FDIC True-Up Provision [Abstract]
Balance, January 1, 2013	$ 8,308	$ 6,768	$ 4,854
Amortization expense	107	168	160
Adjustments related to changes in expected losses	720	1,372	1,754
Loss share termination agreement	(9,135)
Balance, December 31	$ 0	$ 8,308	$ 6,768