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Note 15 - Employee Benefit Plans (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan Maximum Period Allocated for Calculating Average Compensation (Year) | 10 years |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 574,000 |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax, Total | (13,329,000) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax, Total | $ 631,000 | $ 666,000
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 3.00% |
Louisville Hourly Plan [Member] |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 3.15% |
Marion Plan [Member] |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 3.40% |
Louisville Salaried Plan [Member] |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 3.05% |
Defined Contribution Plan [Member] |  |
Defined Contribution Plan, Cost | $ 350,000 | 392,000
Non US Employees Defined Benefit Plan [Member] |  |
Defined Benefit Plan, Plan Assets, Administration Expense | $ 199,000 | $ 185,000
Minimum [Member] |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 3.05% | 3.65%
Maximum [Member] |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 3.40% | 3.90%
Defined Benefit Plan, Equity Securities [Member] | Minimum [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 0.00% |
Defined Benefit Plan, Equity Securities [Member] | Maximum [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 55.00% |
Fixed Income Securities [Member] | Minimum [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 35.00% |
Fixed Income Securities [Member] | Maximum [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 100.00% |
Non Traditional Securities [Member] | Minimum [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 0.00% |
Non Traditional Securities [Member] | Maximum [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 10.00% |

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- Definition Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + 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 (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920 + Details
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