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Note 23 - Employee Benefits - Plan Assets Components (Details)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Plan assets, government bonds [member]      
Statement Line Items [Line Items]      
Plan assets percentage, rated 50.00% 41.00% 29.00%
Plan assets percentage, unrated
Plan assets percentage 50.00% 41.00% 29.00%
Plan assets, corporate bonds [member]      
Statement Line Items [Line Items]      
Plan assets percentage, rated 7.00% 13.00% 23.00%
Plan assets percentage, unrated
Plan assets percentage 7.00% 13.00% 23.00%
Plan assets, equity instruments [member]      
Statement Line Items [Line Items]      
Plan assets percentage, rated 14.00% 18.00% 15.00%
Plan assets percentage, unrated
Plan assets percentage 14.00% 18.00% 15.00%
Plan assets, property [member]      
Statement Line Items [Line Items]      
Plan assets percentage, rated
Plan assets percentage, unrated 1.00%
Plan assets percentage 1.00%
Plan assets, cash [member]      
Statement Line Items [Line Items]      
Plan assets percentage, rated 1.00%
Plan assets percentage, unrated
Plan assets percentage 1.00%
Plan assets, others [member]      
Statement Line Items [Line Items]      
Plan assets percentage, rated 29.00% 27.00% 32.00%
Plan assets percentage, unrated
Plan assets percentage 29.00% 27.00% 32.00%