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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
Mar. 31, 2022
Mar. 31, 2021
Balance $ 427,775 [1] $ 426,730
Other comprehensive loss, net of tax (4,966) (732)
Balance 424,156 425,999
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]    
Balance 15 1,106
Other comprehensive income (loss) before reclassifications (4,658) (646)
Reclassified from AOCI 0 0
Other comprehensive loss, net of tax (4,658) (646)
Balance (4,643) 460
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Balance (1,561) (3,029)
Other comprehensive income (loss) before reclassifications (335) (163)
Reclassified from AOCI 27 77
Other comprehensive loss, net of tax (308) (86)
Balance (1,869) (3,115)
AOCI Attributable to Parent [Member]    
Balance (1,546) (1,923)
Other comprehensive income (loss) before reclassifications (4,993) (809)
Reclassified from AOCI 27 77
Other comprehensive loss, net of tax (4,966) (732)
Balance $ (6,512) $ (2,655)
[1] Derived from audited financial statements