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Note 11 - Employee Benefit Plans - Fair Value and Asset Allocations of Pension Benefits (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Defined Benefit Plan, Fair Value of Plan Assets |  | $ 21,114 | $ 17,819 | $ 19,972
Defined Benefit Plan, Actual Plan Asset Allocations |  | 100.00% | 100.00% |
Defined Benefit Plan, Equity Securities [Member] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | $ 11,534 | $ 9,134 |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 55.00% | 51.00% |
Debt Security, Corporate, US [Member] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | $ 3,919 | $ 3,274 |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 19.00% | 18.00% |
Liability Driven Investment Funds [Member] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | $ 3,615 | $ 4,341 |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 17.00% | 24.00% |
Defined Benefit Plan, Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | $ 1,514 | $ 618 |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 7.00% | 4.00% |
Other Plan Assets [Member] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | $ 532 | $ 452 |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 3.00% | 3.00% |
[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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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