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Note 5 - Comprehensive Income - Components of Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Unrealized holding gains (losses) on available-for-sale debt securities | $ 9,920 | $ (3,392)
Unrealized holding gains on available-for-sale securities, income tax effect | (2,084) | 712
Unrealized holding gains on available-for-sale securities, net of tax amount | 7,836 | (2,680)
Reclassification adjustment for (gains) losses realized in income | (23) | 288
Reclassification adjustment for gains realized in income, income tax effect | 5 | (60)
Reclassification adjustment for gains realized in income, net of tax amount | (18) | 228
Other comprehensive gain (loss) on available-for-sale debt securities | 9,897 | (3,104)
Other comprehensive income on available-for-sale debt securities, income tax effect | (2,079) | 652
Other comprehensive income on available-for-sale debt securities, net of tax amount | 7,818 | (2,452)
Changes from plan amendments and actuarial gains and losses included in other comprehensive income, before tax amount | 87 | 101
Changes from plan amendments and actuarial gains and losses included in other comprehensive income, income tax effect | (19) | (21)
Changes from plan amendments and actuarial gains and losses included in other comprehensive income, net of tax amount | 68 | 80
Amortization of prior service cost and net actuarial gain included in net periodic benefit cost, before tax amount | (32) | (17)
Amortization of prior service cost and net actuarial gain included in net periodic benefit cost, income tax effect | 7 | 3
Amortization of prior service cost and net actuarial gain included in net periodic benefit cost, net of tax amount | (25) | (14)
Other comprehensive gain on unfunded retirement obligations | 55 | 84
Other comprehensive income (loss) on unfunded retirement obligations, income tax effect | (12) | (18)
Other comprehensive income (loss) on unfunded retirement obligations, net of tax amount | 43 | 66
Total other comprehensive income, before tax amount | (9,952) | 3,020
Total other comprehensive income (loss), income tax effect | (2,091) | 634
Total other comprehensive income, net of tax amount | 7,861 | (2,386)
Unrealized holding gains (losses) on available-for-sale securities, before tax amount | 9,920 | (3,392)
Unrealized holding gains (losses) on available-for-sale securities, income tax effect | (2,084) | 712
Unrealized holding (income) losses on available-for-sale securities, net of tax amount | 7,836 | (2,680)
Total other comprehensive income, before tax amount | $ 9,952 | $ (3,020)

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