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Note 18 - Pension and Postretirement Benefits (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan, Prescription Drug Benefit, Accumulated Postretirement Benefit Obligation, Decrease for Subsidy | $ 800,000 | $ 800,000 |
Changes In Assumed Healthcare Cost Trend Rate | 1.00 |  |
Defined Benefit Plan, Prescription Drug Benefit, Net Periodic Postretirement Benefit Cost, (Increase) Decrease for Subsidy | $ 58,200 | $ 48,500 | $ 51,000.0
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 100.00% |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 100.00% | 100.00% |
Equity Securities [Member] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 55.00% |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 52.50% | 53.70% |
Equity Securities [Member] | Minimum [Member] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 40.00% |  |
Equity Securities [Member] | Maximum [Member] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 60.00% |  |
Debt Securities [Member] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 45.00% |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 40.00% | 37.90% |
Debt Securities [Member] | Veba [Member] |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 100.00% | 100.00% |
Foreign Pension Plans [Member] | Minimum [Member] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 10.00% |  |
Foreign Pension Plans [Member] | Maximum [Member] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 20.00% |  |
Fixed Income Funds [Member] | Minimum [Member] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 20.00% |  |
Fixed Income Funds [Member] | Maximum [Member] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 40.00% |  |
Pension Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Contributions by Employer | $ 0 |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 0 |  |
Pension Plan [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 55.00% | 60.00% |
Pension Plan [Member] | Debt Securities [Member] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 45.00% | 40.00% |
Pension Plan And Supplemental Cash Balance Plan [Member] |  |  |
Defined Benefit Plan, Prescription Drug Benefit, Accumulated Postretirement Benefit Obligation, Decrease for Subsidy | $ 700,000 | $ 700,000 |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 1,000,000.0 |  |
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate | 8.00% |  |
Defined Benefit Plan Ultimate Health Care Cost Decreasing Trend Rate | 4.50% |  |
Pension Plan and SERP Plan [Member] |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligations, Expected Return On Plan Assets | 6.50% | 6.75% |

X
- Definition Amount of contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with deferred compensation arrangement. + References No definition available. + Details
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- Definition Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year. + 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 (g) -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 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 + Details
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- Definition Percentage of target 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/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 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of decrease in accumulated postretirement benefit obligation for government subsidy related to prescription drug benefits attributed to past service. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39689-114964 + Details
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- Definition Ultimate trend rate for health care cost for defined benefit postretirement 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 (l) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of (increase) decrease in net periodic benefit cost from government subsidy for prescription drug benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39689-114964 + Details
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