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Note 17 - Weighted-average Assumptions Used to Determine Benefit Obligation Amounts (Details)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
U.S. [Member]      
Weighted Average Assumptions Used To Determine Benefit Obligation Amounts [Line Items]      
Discount rate 3.34% 3.74% 3.89%
Salary increase rate 3.50% 3.43% 3.37%
Non-US [Member]      
Weighted Average Assumptions Used To Determine Benefit Obligation Amounts [Line Items]      
Discount rate 1.90% 2.04% 2.50%
Salary increase rate 2.17% 1.99% 1.91%