Annual report pursuant to Section 13 and 15(d)

Note 19 - Employee Benefit Plans - Weighted-average Assumptions Used to Determine the Projected Benefit Obligation (Details)

v3.20.4
Note 19 - Employee Benefit Plans - Weighted-average Assumptions Used to Determine the Projected Benefit Obligation (Details)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
UNITED STATES | Pension Plan [Member]      
Projected benefit obligation      
Discount rate 2.82% 3.59% 4.39%
Rate of compensation increase 4.09% 4.09% 4.10%
Interest credit rate 5.15% 5.15% 5.15%
Net periodic pension cost      
Discount rate 3.59% 4.39% 3.74%
Rate of compensation increase 4.09% 4.07% 4.10%
Expected return on plan assets 7.52% 7.52% 7.52%
Interest credit rate 5.15% 5.15% 5.15%
UNITED STATES | Other Postretirement Benefits Plan [Member]      
Projected benefit obligation      
Discount rate 2.63% 3.46% 4.26%
Net periodic pension cost      
Discount rate 3.46% 4.26% 3.58%
Foreign Plan [Member] | Pension Plan [Member]      
Projected benefit obligation      
Discount rate 0.69% 1.07% 1.75%
Rate of compensation increase 2.59% 2.65% 2.95%
Interest credit rate 0.33% 0.49% 1.04%
Net periodic pension cost      
Discount rate 1.07% 1.75% 1.65%
Rate of compensation increase 2.65% 2.64% 3.38%
Expected return on plan assets 5.89% 5.89% 5.88%
Interest credit rate 0.49% 1.04% 0.88%
Foreign Plan [Member] | Other Postretirement Benefits Plan [Member]      
Projected benefit obligation      
Discount rate 2.30% 2.90% 3.50%
Net periodic pension cost      
Discount rate 2.90% 3.50% 3.30%