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Note 6 - Employee Benefit Plans - Benefit Obligation and Prepaid Benefit Costs Assumptions (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Discount rate: net periodic pension cost 2.64% 3.32%
Discount rate: projected benefit obligation 2.86% 2.64%
Expected rate of return on plan assets 6.40% 6.45%
Rate of compensation increase: net periodic pension cost 5.00% [1] 2.00%
Rate of compensation increase: projected benefit obligation 5.00% [1] 2.00%
[1] 5.00% for 2022, 2.00% per year thereafter.