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Note 21 - Weighted-average Assumptions Used to Determine the Net Benefit Obligations (Details) - Other Postretirement Benefits Plan [Member]
Dec. 31, 2019
Dec. 31, 2018
Weighted Average Assumptions Used To Determine Net Benefit Obligations [Line Items]    
Discount rate 2.93% 3.59%
Salary increase rate 1.80% 2.35%