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Note 7 - Loans and Related Allowance for Loan Losses (Details) - Troubled Debt Restructurings $ in Thousands | 3 Months Ended
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Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($)
Commercial and Industrial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | 2 | 1
Pre-modification outstanding recorded investment | $ 33 | $ 48
Post-modification outstanding recorded investment | $ 33 | $ 48
Commercial and Industrial [Member] | Extended Maturity [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | 2 | 1
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | 2 | 1
Pre-modification outstanding recorded investment | $ 74 | $ 175
Post-modification outstanding recorded investment | $ 74 | $ 195
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Extended Maturity [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | 2 | 1
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts |  | 2
Pre-modification outstanding recorded investment |  | $ 581
Post-modification outstanding recorded investment |  | $ 581
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member] | Extended Maturity [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts |  | 2

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524 + Details
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