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Note 4 - Fair Value Measurments - Assets Measured on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |
Available-for-sale Securities | $ 10,863 | $ 21,629
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale Securities | 87,525 | 97,290
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale Securities | 21,380 | 24,524
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |
Available-for-sale Securities | 2,068 | 2,263
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] |  |
Available-for-sale Securities | 121,836 | 145,706
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities In Financial Institutions [Member] |  |
Available-for-sale Securities | 1,213 | 809
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale Securities | 123,049 | 146,515
Fair Value, Inputs, Level 2 [Member] |  |
Available-for-sale Securities | 123,049 | 146,515
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities In Financial Institutions [Member] |  |
Available-for-sale Securities | 5 | 5
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale Securities | 5 | 5
Fair Value, Inputs, Level 1 [Member] |  |
Available-for-sale Securities | 5 | 5
US Government Agencies Debt Securities [Member] |  |
Available-for-sale Securities | 10,863 | 21,629
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale Securities | 87,525 | 97,290
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale Securities | 21,380 | 24,524
Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |
Available-for-sale Securities | 2,068 | 2,263
Debt Securities [Member] |  |
Available-for-sale Securities | 121,836 | 145,706
Equity Securities In Financial Institutions [Member] |  |
Available-for-sale Securities | 1,218 | 814
Available-for-sale Securities | $ 123,054 | $ 146,520

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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