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Note 4 - Loans and Related Allowance for Loan Losses (Details) - Additional Information on Impaired Loans - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Note 4 - Loans and Related Allowance for Loan Losses (Details) - Additional Information on Impaired Loans [Line Items] |  |  |
Average recorded investment | $ 13,440 | $ 16,960 | $ 17,824
Interest income recognized | 725 | 640 | 1,090
Commercial and Industrial [Member] |  |  |
Note 4 - Loans and Related Allowance for Loan Losses (Details) - Additional Information on Impaired Loans [Line Items] |  |  |
Average recorded investment | 1,468 | 1,989 | 2,187
Interest income recognized | 100 | 85 | 119
Real Estate Construction Porfolio Segment [Member] |  |  |
Note 4 - Loans and Related Allowance for Loan Losses (Details) - Additional Information on Impaired Loans [Line Items] |  |  |
Average recorded investment | 2,407 | 3,631 | 3,743
Interest income recognized | 115 | 154 | 183
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] |  |  |
Note 4 - Loans and Related Allowance for Loan Losses (Details) - Additional Information on Impaired Loans [Line Items] |  |  |
Average recorded investment | 4,356 | 5,331 | 5,380
Interest income recognized | 160 | 171 | 293
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member] |  |  |
Note 4 - Loans and Related Allowance for Loan Losses (Details) - Additional Information on Impaired Loans [Line Items] |  |  |
Average recorded investment | 5,203 | 5,998 | 6,500
Interest income recognized | 350 | 229 | 493
Consumer Portfolio Segment [Member] |  |  |
Note 4 - Loans and Related Allowance for Loan Losses (Details) - Additional Information on Impaired Loans [Line Items] |  |  |
Average recorded investment | 6 | 11 | 13
Interest income recognized | $ 0 | $ 1 | $ 1

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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=49124121&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=49124121&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=49124121&loc=d3e5212-111524 + Details
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