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Note 16 - Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Balance	$ 332,857	$ 350,714	$ 339,057
Other comprehensive income (loss), net	(77)	(589)	1,415
Balance	428,819	332,857	350,714
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Balance	(285)	975	(544)
Other comprehensive income (loss) before reclassifications	1,117	(1,748)	972
Reclassified from AOCI	34	488	413
Other comprehensive income (loss), net	1,151	(1,260)	1,385
Reclassification of certain tax effects			134
Balance	866	(285)	975
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(1,144)	(1,815)	(1,467)
Other comprehensive income (loss) before reclassifications	(1,448)	446	(132)
Reclassified from AOCI	220	225	162
Other comprehensive income (loss), net	(1,228)	671	30
Reclassification of certain tax effects			(378)
Balance	(2,372)	(1,144)	(1,815)
AOCI Attributable to Parent [Member]
Balance	(1,429)	(840)	(2,011)
Other comprehensive income (loss) before reclassifications	(331)	(1,302)	840
Reclassified from AOCI	254	713	575
Other comprehensive income (loss), net	(77)	(589)	1,415
Reclassification of certain tax effects			(244)
Balance	$ (1,506)	$ (1,429)	$ (840)

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