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Note 19 - Weighted-average Asset Allocation By Assets Category (Details)
Dec. 31, 2018
Dec. 31, 2017
Major US Plans [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 100.00% 100.00%
Major US Plans [Member] | Equity Securities [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 11.00% 10.00%
Major US Plans [Member] | Equity Securities [Member] | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 7.00%  
Major US Plans [Member] | Equity Securities [Member] | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 13.00%  
Major US Plans [Member] | Debt Securities [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 40.00% 42.00%
Major US Plans [Member] | Debt Securities [Member] | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 35.00%  
Major US Plans [Member] | Debt Securities [Member] | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 45.00%  
Major US Plans [Member] | Real Estate [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 2.00% 2.00%
Major US Plans [Member] | Real Estate [Member] | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 0.00%  
Major US Plans [Member] | Real Estate [Member] | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 6.00%  
Major US Plans [Member] | Cash and Cash Equivalents [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 1.00% 1.00%
Major US Plans [Member] | Cash and Cash Equivalents [Member] | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 0.00%  
Major US Plans [Member] | Cash and Cash Equivalents [Member] | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 6.00%  
Major US Plans [Member] | Global Balanced Asset Allocation Funds [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 13.00% 16.00%
Major US Plans [Member] | Global Balanced Asset Allocation Funds [Member] | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 12.00%  
Major US Plans [Member] | Global Balanced Asset Allocation Funds [Member] | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 18.00%  
Major US Plans [Member] | Other Assets [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 33.00% 29.00%
Major US Plans [Member] | Other Assets [Member] | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 27.00%  
Major US Plans [Member] | Other Assets [Member] | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 39.00%  
Major Non-U.S. Plans [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 100.00% 100.00%
Major Non-U.S. Plans [Member] | Equity Securities [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 3.00% 3.00%
Major Non-U.S. Plans [Member] | Equity Securities [Member] | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 0.00%  
Major Non-U.S. Plans [Member] | Equity Securities [Member] | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 6.00%  
Major Non-U.S. Plans [Member] | Debt Securities [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 33.00% 32.00%
Major Non-U.S. Plans [Member] | Debt Securities [Member] | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 30.00%  
Major Non-U.S. Plans [Member] | Debt Securities [Member] | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 40.00%  
Major Non-U.S. Plans [Member] | Real Estate [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 1.00% 1.00%
Major Non-U.S. Plans [Member] | Real Estate [Member] | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 0.00%  
Major Non-U.S. Plans [Member] | Real Estate [Member] | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 6.00%  
Major Non-U.S. Plans [Member] | Cash and Cash Equivalents [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 2.00% 2.00%
Major Non-U.S. Plans [Member] | Cash and Cash Equivalents [Member] | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 0.00%  
Major Non-U.S. Plans [Member] | Cash and Cash Equivalents [Member] | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 6.00%  
Major Non-U.S. Plans [Member] | Global Balanced Asset Allocation Funds [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 4.00% 5.00%
Major Non-U.S. Plans [Member] | Global Balanced Asset Allocation Funds [Member] | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 2.00%  
Major Non-U.S. Plans [Member] | Global Balanced Asset Allocation Funds [Member] | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 8.00%  
Major Non-U.S. Plans [Member] | Other Assets [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 57.00% 57.00%
Major Non-U.S. Plans [Member] | Other Assets [Member] | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 55.00%  
Major Non-U.S. Plans [Member] | Other Assets [Member] | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 65.00%