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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
Mar. 31, 2020
Mar. 31, 2019
Balance $ 428,819 [1] $ 332,857
Other comprehensive income (loss), net 367 696
Balance 411,606 333,102
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]    
Balance 866 (285)
Other comprehensive income (loss) before reclassifications 947 962
Reclassified from AOCI (304)
Other comprehensive income (loss), net 643 962
Balance 1,509 677
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Balance (2,372) (1,144)
Other comprehensive income (loss) before reclassifications (352) (321)
Reclassified from AOCI 76 55
Other comprehensive income (loss), net (276) (266)
Balance (2,648) (1,410)
AOCI Attributable to Parent [Member]    
Balance (1,506) (1,429)
Other comprehensive income (loss) before reclassifications 595 641
Reclassified from AOCI (228) 55
Other comprehensive income (loss), net 367 696
Balance $ (1,139) $ (733)
[1] Derived from audited financial statements