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Note 20 - Weighted-average Assumption Used to Determine Net Post-retirement Benefit Cost (Details) - Other Postretirement Benefits Plan [Member]
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Weighted Average Assumption Used To Determine Net Postretirement Benefit Cost [Line Items]    
Effective rate for interest cost 2.88% 2.89%
Salary increase rate 2.35% 2.35%