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Note 8 - Components of Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Balance | $ 184,896 | $ 178,263
Unrealized holding gain on securities transferred from held to maturity to available for sale, net of tax of $237 | 891 |
Balance | 188,157 | 187,661
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |
Balance | (3,704) | (3,588)
Unrealized holding gain (loss) on available for sale securities, net of tax | (5,182) | 2,294
Reclassification adjustment, net of tax of ($1) |  | (3)
Unrealized holding gain on securities transferred from held to maturity to available for sale, net of tax of $237 | 891 |
Balance | (7,995) | (1,297)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |
Balance | (5,991) | (5,071)
Unrealized holding gain (loss) on available for sale securities, net of tax | 0 | 0
Reclassification adjustment, net of tax of ($1) |  | 0
Unrealized holding gain on securities transferred from held to maturity to available for sale, net of tax of $237 | 0 |
Balance | (5,991) | (5,071)
AOCI Attributable to Parent [Member] |  |
Balance | (9,695) | (8,659)
Unrealized holding gain (loss) on available for sale securities, net of tax | (5,182) | 2,294
Reclassification adjustment, net of tax of ($1) |  | (3)
Unrealized holding gain on securities transferred from held to maturity to available for sale, net of tax of $237 | 891 |
Balance | $ (13,986) | $ (6,368)

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