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Note 20 - Weighted-average Asset Allocation By Assets Category (Details)
Dec. 31, 2019
Dec. 31, 2018
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 10.00% 11.00%
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 44.00% 40.00%
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 1.00% 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 15.00% 13.00%
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 [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 29.00% 33.00%
Major US Plans [Member] | Other [Member] | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 27.00%  
Major US Plans [Member] | Other [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 5.00% 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 10.00%  
Major Non-U.S. Plans [Member] | Debt Securities [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 31.00% 33.00%
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 2.00% 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 5.00% 4.00%
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 0.00%  
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 10.00%  
Major Non-U.S. Plans [Member] | Other [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 55.00% 57.00%
Major Non-U.S. Plans [Member] | Other [Member] | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 55.00%  
Major Non-U.S. Plans [Member] | Other [Member] | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 65.00%