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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, 2021
Dec. 31, 2020
Reclassification adjustment for gain included in net income, tax $ (1) $ (23)
Realized gain on available for sale securities, net of tax, reclassified out of accumulated other comprehensive loss (5) (85)
Income tax benefit 2 23
Amortization of defined benefit pension items, net of tax, reclassified out of accumulated other comprehensive loss (9) (87)
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Realized securities gain, net (6) (108)
Reclassification adjustment for gain included in net income, tax (1) (23)
Realized gain on available for sale securities, net of tax, reclassified out of accumulated other comprehensive loss (5) (85)
Prior service costs(1) [1] (11) (110)
Income tax benefit (2) (23)
Amortization of defined benefit pension items, net of tax, reclassified out of accumulated other comprehensive loss $ (9) $ (87)
[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.)