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Note 17 - Weighted-average Assumptions Used to Determine Net Pension (Income) Expenses (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
U.S. [Member]      
Weighted Average Assumptions Used To Determine Net Pension Income Expenses [Line Items]      
Effective rate for service cost 3.68% 3.49% 3.50%
Effective rate for interest cost 3.06% 2.82% 3.50%
Salary increase rate 3.43% 3.37% 3.34%
Expected long-term rate of return on plan assets 7.00% 7.40% 7.40%
Non-US [Member]      
Weighted Average Assumptions Used To Determine Net Pension Income Expenses [Line Items]      
Effective rate for service cost 2.66% 2.81% 2.09%
Effective rate for interest cost 1.56% 1.90% 2.09%
Salary increase rate 2.09% 1.91% 1.95%
Expected long-term rate of return on plan assets 4.21% 4.65% 4.69%