Note 7 - Components of Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Balances	$ 161,289	$ 189,069	$ 191,751	$ 200,607
Unrealized holding gain on available for sale securities, net of tax			(58,719)
Reclassification adjustment, net of tax				(4)
Balances	136,240	191,235	136,240	191,235
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balances	(30,972)	854	2,854	13,167
Unrealized holding gain on available for sale securities, net of tax	(24,893)	7,235		(5,074)
Balances	(55,865)	8,089	(55,865)	8,089
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balances	(6,912)	(10,147)	(6,912)	(10,147)
Balances	(6,912)	(10,147)	(6,912)	(10,147)
AOCI Attributable to Parent [Member]
Balances	(37,884)	(9,293)	(4,058)	3,020
Unrealized holding gain on available for sale securities, net of tax	(24,893)	7,235		(5,074)
Balances	$ (62,777)	$ (2,058)	$ (62,777)	$ (2,058)

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
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-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
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-Section 55
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-URI https://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
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-Section 50
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-URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details