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Note 1 - Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
AOCI, Debt Securities, Available-for-sale, Adjustment, after Tax, Total $ 13,959 $ 1,713
Unrecognized gains on post-retirement benefits 0 158
Tax effect (2,931) (393)
Accumulated other comprehensive income (loss) $ 11,028 $ 1,478