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Note 7 - Employee Benefit Plans - Fair Value and Asset Allocations of Pension Benefits (Details) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan, Fair Value of Plan Assets		$ 16,940	$ 15,576	$ 27,252
Defined Benefit Plan, Actual Plan Asset Allocations		100.00%	100.00%
Debt Security, Corporate, US [Member]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	$ 11,761	$ 11,714
Defined Benefit Plan, Actual Plan Asset Allocations		69.00%	75.00%
Defined Benefit Plan, Equity Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets		$ 3,567	$ 3,507
Defined Benefit Plan, Actual Plan Asset Allocations		21.00%	23.00%
Defined Benefit Plan, Cash and Cash Equivalents [Member]
Defined Benefit Plan, Fair Value of Plan Assets		$ 304	$ 185
Defined Benefit Plan, Actual Plan Asset Allocations		2.00%	1.00%
Other Plan Assets [Member]
Defined Benefit Plan, Fair Value of Plan Assets		$ 1,308	$ 170
Defined Benefit Plan, Actual Plan Asset Allocations		8.00%	1.00%
[1] Updated dimension from: "Debt Securities [Member]".

X

- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
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Reference 7: http://www.xbrl.org/2003/role/exampleRef
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X

- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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