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Note 7 - Loans and Related Allowance for Loan Losses (Details) - Additional Information on Impaired Loans - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
Total: |  |
Average recorded investment | $ 14,665 | $ 13,214
Interest income recognized | 197 | 111
Commercial and Industrial [Member] |  |
Total: |  |
Average recorded investment | 1,337 | 1,227
Interest income recognized | 13 | 14
Real Estate Construction Porfolio Segment [Member] |  |
Total: |  |
Average recorded investment | 1,620 | 2,882
Interest income recognized | 25 | 20
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] |  |
Total: |  |
Average recorded investment | 3,983 | 4,833
Interest income recognized | 36 | 38
Commercial Portfolio Segment [Member] |  |
Total: |  |
Average recorded investment | 7,719 | 4,266
Interest income recognized | 123 | 39
Consumer Portfolio Segment [Member] |  |
Total: |  |
Average recorded investment | 6 | $ 6
Interest income recognized | $ 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://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=66008989&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=66008989&loc=d3e5258-111524 + Details
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