Note 13 - Employee Retirement Plans - Schedule of Assumptions Used in Determining Net Periodic Costs and Summary of Healthcare Cost Trend Rates (Details) - Other Postretirement Benefits Plan [Member] |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Discount rate | 2.50% | 2.10% | 3.00% |
| Ultimate healthcare cost trend rate | 4.50% | 4.50% | 4.50% |
| Participation | 60.00% | 60.00% | 60.00% |
| X | ||||||||||
- Definition Represents the assumed number of participants for determining the health care cost trend rate. No definition available.
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| X | ||||||||||
- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Ultimate trend rate for health care cost for defined benefit postretirement plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|