Note 6 - Allowance for Loan Losses and Impaired Loans - Purchased Credit Impaired Loans (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Contractually required payments receivable of loans	$ 2,178
Cash flows expected to be collected at acquisition	1,781
Fair value of acquired loans at acquisition	1,781
Residential Loan [Member]
Contractually required payments receivable of loans	233
Commercial Mortgage Loan [Member]
Contractually required payments receivable of loans	1,724
Commercial and Agricultural Loan [Member]
Contractually required payments receivable of loans	$ 221

Fair value at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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