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Note 7 - Loans - Average Balance and Interest Income Recognized Related to Impaired Loans (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Average Recorded Investment | $ 118,213 | $ 137,405
Interest Income Recognized | 1,000 | 1,207
Commercial Portfolio Segment [Member] |  |
Average Recorded Investment | 23,335 | 12,670
Interest Income Recognized | 83,000 | 120,000
Real Estate Construction Portfolio Segment [Member] |  |
Average Recorded Investment | 16,930 | 20,292
Interest Income Recognized | 340,000 | 65,000
Commercial Real Estate Portfolio Segment [Member] |  |
Average Recorded Investment | 61,405,000 | 87,452,000
Interest Income Recognized | 445 | 890
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Average Recorded Investment | 16,543 | 16,991
Interest Income Recognized | $ 132 | $ 132

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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