Note 4 - Loans and Allowance for Loan Losses - Acquired Impaired Loans Accretable Yield (Details) - USD ($)		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Balance at beginning of period		$ 5,193,000	$ 4,998,000
Additions		245,000	26,000
Accretion income		(2,388,000)	(2,607,000)
Net reclassification from nonaccretable to accretable		4,635,000	4,272,000
Reductions	[1]	(1,761,000)	(1,496,000)
Removal due to pool excess recovery (2)	[2]	(4,198,000)
Balance at end of period		$ 1,726,000	$ 5,193,000

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

[2] Cost recovery accounting occurs once a pool's recorded investment is reduced to zero based on the outcome of the aggregated loan level activity at cash flow estimation. Proceeds received on pools in recovery status are deemed as recovery income, and are recorded as interest income as payments are received, with accretion no longer being recognized.