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Note 8 - Components of Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Balances | $ 184,896 | $ 178,263
Balances | 185,537 | 182,987
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |
Balances | (3,704) | (3,588)
Unrealized holding gain (loss) on available for sale securities, net of tax | (2,655) | 1,075
Balances | (6,359) | (2,513)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |
Balances | (5,991) | (5,071)
Unrealized holding gain (loss) on available for sale securities, net of tax | 0 | 0
Balances | (5,991) | (5,071)
AOCI Attributable to Parent [Member] |  |
Balances | (9,695) | (8,659)
Unrealized holding gain (loss) on available for sale securities, net of tax | (2,655) | 1,075
Balances | $ (12,350) | $ (7,584)

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