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Note 20 - Weighted-average Assumptions Used to Determine Benefit Obligation Amounts (Details)
Dec. 31, 2020
Dec. 31, 2019
U.S. [Member]    
Weighted Average Assumptions Used To Determine Benefit Obligation Amounts [Line Items]    
Discount rate 2.09% 2.97%
Salary increase rate 3.50% 3.50%
Interest crediting rate for cash balance plan 1.75% 2.50%
Non-US [Member]    
Weighted Average Assumptions Used To Determine Benefit Obligation Amounts [Line Items]    
Discount rate 1.01% 1.44%
Salary increase rate 1.56% 1.72%