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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]".

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- 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 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 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 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- 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 + Details
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