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Note 11 - Fair Value of Financial Instruments and Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Recurring Securities Available for Sale | $ 318,032 | $ 354,247
Fair Value, Measurements, Recurring [Member] |  |
Recurring Securities Available for Sale | 318,032 | 354,247
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Recurring Securities Available for Sale |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Recurring Securities Available for Sale | 311,402 | 346,949
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Recurring Securities Available for Sale | 6,630 | 7,298
Fair Value, Measurements, Nonrecurring [Member] |  |
Impaired Loans | 5,185 | 4,876
Other Real Estate | 1,468 | 2,015
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Impaired Loans |  |
Other Real Estate |  |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Impaired Loans |  |
Other Real Estate |  |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Impaired Loans | 5,185 | 4,876
Other Real Estate | 1,468 | 2,015
US Government Agencies Debt Securities [Member] |  |
Recurring Securities Available for Sale | 311,178 | 346,723
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Recurring Securities Available for Sale | 311,178 | 346,723
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Recurring Securities Available for Sale |  |
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Recurring Securities Available for Sale | 306,763 | 341,701
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Recurring Securities Available for Sale | 4,415 | 5,022
US States and Political Subdivisions Debt Securities [Member] |  |
Recurring Securities Available for Sale | 3,972 | 4,493
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Recurring Securities Available for Sale | 3,972 | 4,493
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Recurring Securities Available for Sale |  |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Recurring Securities Available for Sale | 3,757 | 4,277
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Recurring Securities Available for Sale | 215 | 216
Corporate Debt Securities [Member] |  |
Recurring Securities Available for Sale | 2,882 | 2,060
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Recurring Securities Available for Sale | 2,882 | 2,060
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Recurring Securities Available for Sale |  |
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Recurring Securities Available for Sale | 882 |
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Recurring Securities Available for Sale | $ 2,000 | 2,060
Asset-backed Securities [Member] |  |
Recurring Securities Available for Sale |  | 971
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Recurring Securities Available for Sale |  | 971
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Recurring Securities Available for Sale |  |
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Recurring Securities Available for Sale |  | $ 971

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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