Note 13 - Employee Retirement Plans - Weighted-average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Plan [Member] | UNITED STATES
Discount rate	2.87%	2.50%	3.28%
Rate of compensation increase	3.50%	4.16%	3.50%
Cash balance crediting rate	3.86%	3.84%	3.94%
Employee contributions crediting rate	1.57%	0.62%	2.03%
Discount rate	2.50%	3.28%	4.28%
Expected return on plan assets	6.00%	6.00%	6.00%
Rate of compensation increase	4.16%	3.50%	3.50%
Cash balance crediting rate	3.84%	3.94%	3.94%
Employee contributions crediting rate	0.62%	2.03%	3.47%
Pension Plan [Member] | Foreign Plan [Member]
Discount rate	1.20%	1.02%	1.34%
Rate of compensation increase	3.63%	3.55%	2.96%
Cash balance crediting rate	0.91%	0.94%	0.97%
Discount rate	1.02%	1.34%	1.96%
Expected return on plan assets	1.26%	1.71%	2.01%
Rate of compensation increase	3.55%	2.96%	2.96%
Cash balance crediting rate	0.94%	0.97%	0.97%
Other Postretirement Benefits Plan [Member]
Discount rate	2.99%	2.69%	3.41%
Discount rate	2.69%	3.41%	4.33%