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Note 20 - Weighted-average Assumptions Used to Determine the Net Benefit Obligations (Details) - Other Postretirement Benefits Plan [Member]
Dec. 31, 2018
Dec. 31, 2017
Weighted Average Assumptions Used To Determine Net Benefit Obligations [Line Items]    
Discount rate 3.59% 3.21%
Salary increase rate 2.35% 2.35%