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Note 16 - Components of Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income tax benefit $ 23 $ 119 $ 4
Realized gain on available for sale securities, net of tax, reclassified out of accumulated other comprehensive loss (85) (447) (13)
Income tax benefit 23 23 24
Amortization of defined benefit pension items, net of tax, reclassified out of accumulated other comprehensive loss (87) (87) (86)
Reclassification out of Accumulated Other Comprehensive Income [Member]      
Realized securities gain, net (108) (566) (17)
Income tax benefit (23) (119) (4)
Realized gain on available for sale securities, net of tax, reclassified out of accumulated other comprehensive loss (85) (447) (13)
Prior service costs(1) [1] (110) (110) (110)
Income tax benefit (23) (23) (24)
Amortization of defined benefit pension items, net of tax, reclassified out of accumulated other comprehensive loss $ (87) $ (87) $ (86)
[1] This accumulated other comprehensive income (loss) component is included in the computation of net periodic benefit cost. (For additional information, see Note 8, Employee Benefit Plans.)