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Note 7 - Loans - Average Balance of Impaired Loans and Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Average investment in impaired loans | $ 6,888 | $ 8,135
Interest income recognized on impaired loans on a cash basis | 44 | 61
Residential Portfolio Segment [Member] |  |
Average investment in impaired loans | 1,679 | 1,272
Interest income recognized on impaired loans on a cash basis | 9 | 12
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Senior Lien [Member] |  |
Average investment in impaired loans | 1,232 | 981
Interest income recognized on impaired loans on a cash basis | 8 | 10
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Junior Lien [Member] |  |
Average investment in impaired loans | 382 | 291
Interest income recognized on impaired loans on a cash basis | 0 | 2
Residential Portfolio Segment [Member] | Home Equity Line of Credit [Member] |  |
Average investment in impaired loans | 65 | 0
Interest income recognized on impaired loans on a cash basis | 1 | 0
Commercial Portfolio Segment [Member] |  |
Average investment in impaired loans | 5,209 | 6,855
Interest income recognized on impaired loans on a cash basis | 35 | 49
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] |  |
Average investment in impaired loans | 387 | 3,040
Interest income recognized on impaired loans on a cash basis | 4 | 10
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] |  |
Average investment in impaired loans | 2,872 | 1,713
Interest income recognized on impaired loans on a cash basis | 1 | 26
Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |
Average investment in impaired loans | 1,308 | 0
Interest income recognized on impaired loans on a cash basis | 12 | 0
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member] |  |
Average investment in impaired loans | 516 | 1,442
Interest income recognized on impaired loans on a cash basis | 17 | 1
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] |  |
Average investment in impaired loans | 76 | 660
Interest income recognized on impaired loans on a cash basis | 0 | 12
Commercial Portfolio Segment [Member] | Other Commercial Loans [Member] |  |
Average investment in impaired loans | 50 | 0
Interest income recognized on impaired loans on a cash basis | 1 | 0
Consumer Portfolio Segment [Member] |  |
Average investment in impaired loans | 0 | 8
Interest income recognized on impaired loans on a cash basis | $ 0 | $ 0

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5258-111524 + Details
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