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Note 12 - Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Balance $ 425,999 $ 411,606 $ 426,730 [1] $ 428,819
Other comprehensive (loss) income, net of tax 90 31 (642) 398
Balance 427,534 415,830 427,534 415,830
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]        
Balance 460 1,509 1,106 866
Other comprehensive income (loss) before reclassifications 14 (45) (632) 902
Reclassified from AOCI 0 0 0 (304)
Other comprehensive (loss) income, net of tax 14 (45) (632) 598
Balance 474 1,464 474 1,464
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Balance (3,115) (2,648) (3,029) (2,372)
Other comprehensive income (loss) before reclassifications 0 0 (162) (353)
Reclassified from AOCI 76 76 152 153
Other comprehensive (loss) income, net of tax 76 76 (10) (200)
Balance (3,039) (2,572) (3,039) (2,572)
AOCI Attributable to Parent [Member]        
Balance (2,655) (1,139) (1,923) (1,506)
Other comprehensive income (loss) before reclassifications 14 (45) (794) 549
Reclassified from AOCI 76 76 152 (151)
Other comprehensive (loss) income, net of tax 90 31 (642) 398
Balance $ (2,565) $ (1,108) $ (2,565) $ (1,108)
[1] Derived from audited financial statements