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Note 14 - Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Balance $ 415,830 $ 333,686 $ 428,819 [1] $ 332,857
Other comprehensive (loss) income, net of tax (136) 76 262 1,124
Balance 419,917 337,363 419,917 337,363
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]        
Balance 1,464 973 866 (285)
Other comprehensive income (loss) before reclassifications (213) 23 689 1,247
Reclassified from AOCI 0 0 (304) 34
Other comprehensive (loss) income, net of tax (213) 23 385 1,281
Balance 1,251 996 1,251 996
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Balance (2,572) (1,354) (2,372) (1,144)
Other comprehensive income (loss) before reclassifications 1 (2) (352) (322)
Reclassified from AOCI 76 55 229 165
Other comprehensive (loss) income, net of tax 77 53 (123) (157)
Balance (2,495) (1,301) (2,495) (1,301)
AOCI Attributable to Parent [Member]        
Balance (1,108) (381) (1,506) (1,429)
Other comprehensive income (loss) before reclassifications (212) 21 337 925
Reclassified from AOCI 76 55 (75) 199
Other comprehensive (loss) income, net of tax (136) 76 262 1,124
Balance $ (1,244) $ (305) $ (1,244) $ (305)
[1] Derived from audited financial statements