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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Balance $ 424,156 $ 425,999 $ 427,775 [1] $ 426,730
Other comprehensive (loss) income, net of tax (5,148) 90 (10,114) (642)
Balance 418,046 427,534 418,046 427,534
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]        
Balance (4,643) 460 15 1,106
Other comprehensive income (loss) before reclassifications (5,174) 14 (9,832) (632)
Reclassified from AOCI 0 0 0 0
Other comprehensive (loss) income, net of tax (5,174) 14 (9,832) (632)
Balance (9,817) 474 (9,817) 474
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Balance (1,869) (3,115) (1,561) (3,029)
Other comprehensive income (loss) before reclassifications 0 0 (335) (162)
Reclassified from AOCI 26 76 53 152
Other comprehensive (loss) income, net of tax 26 76 (282) (10)
Balance (1,843) (3,039) (1,843) (3,039)
AOCI Attributable to Parent [Member]        
Balance (6,512) (2,655) (1,546) (1,923)
Other comprehensive income (loss) before reclassifications (5,174) 14 (10,167) (794)
Reclassified from AOCI 26 76 53 152
Other comprehensive (loss) income, net of tax (5,148) 90 (10,114) (642)
Balance $ (11,660) $ (2,565) $ (11,660) $ (2,565)
[1] Derived from audited financial statements