Note 3 - Loans and Allowance for Loan Losses - Acquired Impaired Loans Accretable Yield (Details) - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Balance at beginning of period		$ 6,319,000	$ 5,241,000	$ 5,193,000	$ 4,998,000
Additions		0	0	21,000	0
Accretion income		(674,000)	(681,000)	(1,354,000)	(1,327,000)
Net reclassification from nonaccretable to accretable		1,193,000	708,000	3,565,000	1,649,000
Reductions (1)	[1]	(236,000)	(153,000)	(823,000)	(205,000)
Balance at end of period		$ 6,602,000	$ 5,115,000	$ 6,602,000	$ 5,115,000

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