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Note 3 - Loans and Allowance for Loan Losses - Acquired Impaired Loans Accretable Yield (Details) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Balance at beginning of period $ 1,726,000 $ 5,193,000
Additions 1,000 21,000
Accretion income (147,000) (680,000)
Net reclassification from nonaccretable to accretable 63,000 2,372,000
Reductions [1] (179,000) (587,000)
Balance at end of period $ 1,464,000 $ 6,319,000
[1] Reductions primarily reflect the result of exit events, including loan payoffs and charge-offs.