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Note 4 - Comprehensive Income - Components of Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Other comprehensive income from available-for-sale debt securities, Unrealized holding gains on available-for-sale debt securities, before tax amount | $ 7,240 | $ 4,261
Other comprehensive income from available-for-sale debt securities, Unrealized holding gains on available-for-sale debt securities, income tax effect | (1,521) | (895)
Other comprehensive income from available-for-sale debt securities, Unrealized holding gains on available-for-sale debt securities, net of tax amount | 5,719 | 3,366
Changes from plan amendments and actuarial gains and losses, before tax amount | 88 | 214
Changes from plan amendments and actuarial gains and losses, income tax effect | (18) | (45)
Changes from plan amendments and actuarial gains and losses, net of tax amount | 70 | 169
Amortization of prior service cost and net actuarial gain included in net periodic benefit cost, before tax amount | (8) | (8)
Amortization of prior service cost and net actuarial gain included in net periodic benefit cost, income tax effect | 2 | 2
Amortization of prior service cost and net actuarial gain included in net periodic benefit cost, net of tax amount | (6) | (6)
Other comprehensive gain on unfunded retirement obligations | 80 | 206
Other comprehensive income (loss) on unfunded retirement obligations, income tax effect | (16) | (43)
Other comprehensive income (loss) on unfunded retirement obligations, net of tax amount | 64 | 163
Total other comprehensive income, before tax amount | (7,320) | (4,467)
Total other comprehensive income (loss), income tax effect | (1,537) | (938)
Total other comprehensive income, net of tax amount | $ 5,783 | $ 3,529

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