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Note 16 - Components of Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Balance $ 183,726 $ 190,238 $ 184,896
Transfer from held to maturity to available for sale securities, net of tax     891
Less amortization of prior service cost included in net periodic pension cost, net of tax (87) (87) (86)
Balance 200,607 183,726 190,238
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]      
Balance 76 (5,072) (3,704)
Unrealized holding gain (loss) on available for sale securities, net of tax 13,176 5,595 (2,246)
Transfer from held to maturity to available for sale securities, net of tax     891
Reclassification adjustment, net of tax (85) (447) (13)
Balance 13,167 76 (5,072)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Balance (8,582) (7,013) (5,991)
Net pension gain (loss) arising during the period, net of tax (1,478) (1,482) (936)
Less amortization of prior service cost included in net periodic pension cost, net of tax (87) (87) (86)
Balance (10,147) (8,582) (7,013)
AOCI Attributable to Parent [Member]      
Balance (8,506) (12,085) (9,695)
Unrealized holding gain (loss) on available for sale securities, net of tax 13,176 5,595 (2,246)
Transfer from held to maturity to available for sale securities, net of tax     891
Reclassification adjustment, net of tax (85) (447) (13)
Net pension gain (loss) arising during the period, net of tax (1,478) (1,482) (936)
Less amortization of prior service cost included in net periodic pension cost, net of tax (87) (87) (86)
Balance $ 3,020 $ (8,506) $ (12,085)