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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, 2021
Mar. 31, 2020
Balance $ 426,730 [1] $ 428,819
Other comprehensive (loss) income, net of tax (732) 367
Balance 425,999 411,606
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]    
Balance 1,106 866
Other comprehensive income (loss) before reclassifications (646) 947
Reclassified from AOCI 0 (304)
Other comprehensive (loss) income, net of tax (646) 643
Balance 460 1,509
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Balance (3,029) (2,372)
Other comprehensive income (loss) before reclassifications (163) (352)
Reclassified from AOCI 77 76
Other comprehensive (loss) income, net of tax (86) (276)
Balance (3,115) (2,648)
AOCI Attributable to Parent [Member]    
Balance (1,923) (1,506)
Other comprehensive income (loss) before reclassifications (809) 595
Reclassified from AOCI 77 (228)
Other comprehensive (loss) income, net of tax (732) 367
Balance $ (2,655) $ (1,139)
[1] Derived from audited financial statements