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Note 18 - Pension and Postretirement Benefits (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2021
Defined Benefit Plan, Prescription Drug Benefit, Accumulated Postretirement Benefit Obligation, Decrease for Subsidy | $ 800,000 | $ 800,000 |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 0 |  |  |
Defined Benefit Plan, Prescription Drug Benefit, Net Periodic Postretirement Benefit Cost, (Increase) Decrease for Subsidy | $ 75,800 | $ 58,200 | $ 48,500 |
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 | 50.00% |  |  | 50.00%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 45.80% | 52.50% |  |
Debt Securities [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 50.00% |  |  | 50.00%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 47.80% | 40.00% |  |
Debt Securities [Member] | Veba [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 100.00% | 100.00% |  |
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 | $ 1,400,000 |  |  |
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate | 7.75% |  |  |
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 | 6.25% | 6.50% |  |
Pension Plan [Member] | Equity Securities [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  | 55.00% |  |
Pension Plan [Member] | Debt Securities [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  | 45.00% |  |

X
- 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=123447040&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=123450688&loc=d3e4587-114921 + Details
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X
- 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=123450688&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=123447040&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=123447040&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=123447040&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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- Definition This element represents the anticipated increase in the plan assets used in calculating benefit obligations. + References No definition available. + Details
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- Definition This element represents the projected trend rate for health care costs in the future. + References No definition available. + Details
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