Note 3 - Loans and Allowance for Loan Losses (Details) - Acquired Impaired Loans Accretable Yield - USD ($)		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Acquired Impaired Loans Accretable Yield [Abstract]
Beginning balance		$ 5,193,000	$ 4,998,000
Additions		21,000	0
Accretion income		(680,000)	(646,000)
Net reclassification from nonaccretable to accretable		2,372,000	941,000
Reductions	[1]	(587,000)	(52,000)
Ending balance		$ 6,319,000	$ 5,241,000

[1] Reductions primarily reflect the result of exit events, including loan payoffs and charge-offs.