Note 12 - Pension and Postretirement Benefit Plans - Significant Weighted Average Assumptions Used in Measurement of Pension and Postretirement Benefit Obligations (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
UNITED STATES | Pension Plan [Member]
Benefit obligations:
Discount rate	2.83%	2.43%	3.21%
Net periodic benefit cost:
Discount rate	1.72%	2.79%	3.41%
Expected return on plan assets	3.50%	5.00%	6.00%
UNITED STATES | Other Postretirement Benefits Plan [Member]
Benefit obligations:
Discount rate	2.99%	2.67%	3.37%
Net periodic benefit cost:
Discount rate	2.57%	3.19%	4.08%
Foreign Plan [Member] | Pension Plan [Member]
Benefit obligations:
Discount rate	1.97%	1.40%	1.72%
Net periodic benefit cost:
Discount rate	1.79%	2.10%	2.50%
Rate of compensation increase	2.97%	3.36%	3.28%
Expected return on plan assets	3.57%	4.45%	4.61%
Foreign Plan [Member] | Other Postretirement Benefits Plan [Member]
Benefit obligations:
Discount rate	3.08%	2.55%	3.10%
Net periodic benefit cost:
Discount rate	2.62%	3.15%	3.76%
Initial health care cost trend rate	2.27%	4.64%	4.22%
Ultimate health care cost trend rate	4.20%	5.13%	4.93%
Year ultimate reached	2032	2023	2023