Note 3 - Loans and Allowance for Loan Losses - Acquired Impaired Loans Accretable Yield (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Balance at beginning of period		$ 6,602,000	$ 5,115,000	$ 5,193,000	$ 4,998,000
Additions		224,000	16,000	245,000	16,000
Accretion income		(638,000)	(653,000)	(1,992,000)	(1,980,000)
Net reclassification from nonaccretable to accretable		1,000,000	1,520,000	4,565,000	3,166,000
Reductions	[1]	(407,000)	(548,000)	(1,230,000)	(750,000)
Balance at end of period		$ 6,781,000	$ 5,450,000	$ 6,781,000	$ 5,450,000

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