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Note 19 - Weighted-average Asset Allocation By Assets Category (Details)
Dec. 31, 2021
Dec. 31, 2020
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 5.00% 7.00%
Major US Plans [Member] | Equity Securities [Member] | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 2.00%  
Major US Plans [Member] | Equity Securities [Member] | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 8.00%  
Major US Plans [Member] | Debt Securities [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 11.00% 12.00%
Major US Plans [Member] | Debt Securities [Member] | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 9.00%  
Major US Plans [Member] | Debt Securities [Member] | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 15.00%  
Major US Plans [Member] | Real Estate [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 1.00% 1.00%
Target asset allocations 0.00%  
Major US Plans [Member] | Defined Benefit Plan, Cash and Cash Equivalents    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 5.00% 5.00%
Major US Plans [Member] | Defined Benefit Plan, Cash and Cash Equivalents | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 0.00%  
Major US Plans [Member] | Defined Benefit Plan, Cash and Cash Equivalents | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 10.00%  
Major US Plans [Member] | Global Balanced Asset Allocation Funds [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 8.00% 14.00%
Major US Plans [Member] | Global Balanced Asset Allocation Funds [Member] | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 5.00%  
Major US Plans [Member] | Global Balanced Asset Allocation Funds [Member] | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 11.00%  
Major US Plans [Member] | Private Equity [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 26.00% 21.00%
Major US Plans [Member] | Private Equity [Member] | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 15.00%  
Major US Plans [Member] | Private Equity [Member] | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 21.00%  
Major US Plans [Member] | Hedge Funds [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations [1] 44.00% 40.00%
Major US Plans [Member] | Hedge Funds [Member] | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations [1] 49.00%  
Major US Plans [Member] | Hedge Funds [Member] | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations [1] 61.00%  
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 6.00% 5.00%
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 17.00% 26.00%
Major Non-U.S. Plans [Member] | Debt Securities [Member] | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 10.00%  
Major Non-U.S. Plans [Member] | Debt Securities [Member] | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 20.00%  
Major Non-U.S. Plans [Member] | Real Estate [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 2.00% 2.00%
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 5.00%  
Major Non-U.S. Plans [Member] | Defined Benefit Plan, Cash and Cash Equivalents    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 2.00% 2.00%
Major Non-U.S. Plans [Member] | Defined Benefit Plan, Cash and Cash Equivalents | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 0.00%  
Major Non-U.S. Plans [Member] | Defined Benefit Plan, Cash and Cash Equivalents | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 5.00%  
Major Non-U.S. Plans [Member] | Global Balanced Asset Allocation Funds [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 0.00% 6.00%
Target asset allocations 0.00%  
Major Non-U.S. Plans [Member] | Private Equity [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 7.00% 4.00%
Major Non-U.S. Plans [Member] | Private Equity [Member] | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 0.00%  
Major Non-U.S. Plans [Member] | Private Equity [Member] | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 10.00%  
Major Non-U.S. Plans [Member] | Hedge Funds [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 5.00% 7.00%
Major Non-U.S. Plans [Member] | Hedge Funds [Member] | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 0.00%  
Major Non-U.S. Plans [Member] | Hedge Funds [Member] | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 10.00%  
Major Non-U.S. Plans [Member] | Insurance Contracts    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Asset allocations 61.00% 48.00%
Major Non-U.S. Plans [Member] | Insurance Contracts | Minimum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 25.00%  
Major Non-U.S. Plans [Member] | Insurance Contracts | Maximum [Member]    
Weighted Average Asset Allocation By Assets Category [Line Items]    
Target asset allocations 75.00%  
[1] The 2021 target for hedge funds includes a policy allocation to U.S. government bonds that is obtained via treasury futures contracts