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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