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Note 18 - Weighted-average Assumptions Used to Determine the Net Benefit Obligations (Details) - Other Postretirement Benefit Plans [Member]
Dec. 31, 2017
Dec. 31, 2016
Weighted Average Assumptions Used To Determine Net Benefit Obligations [Line Items]    
Discount rate 3.20% 3.44%
Salary increase rate 2.35% 2.35%