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Note 17 - Contingencies (Details Textual)
$ in Thousands
12 Months Ended
Oct. 30, 2009
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Oct. 26, 2018
BKK Working Group [Member]        
Loss Contingency, Number of Entities Cooperating With Legal Matter   63    
Minimum [Member] | BKK Working Group [Member]        
Loss Contingency, Number of Companies Involved   500    
Syracuse China Company and Libbey Glass Inc. [Member]        
Loss Contingency, Claim for Indemnification, Incurred   $ 500    
Syracuse China Company and Libbey Glass Inc. [Member] | TPC York [Member]        
Loss Contingency, Claim for Indemnification, Remaining Liability Of Counterparty   2,800    
Loss Contingency, Claim for Indemnification, Reimbursement Received   1,400    
Syracuse China Company and Libbey Glass Inc. [Member] | Maximum [Member] | TPC York [Member]        
Loss Contingency, Claim for Indemnification   7,500    
Lower Ley Creek Sub-site [Member]        
Site Contingency Number of Potentially Responsible Parties 8      
Lower Ley Creek Sub-site [Member] | Unfavorable Regulatory Action [Member] | Other Noncurrent Liabilities [Member]        
Accrued Environmental Loss Contingencies, Noncurrent   700 $ 700  
Lower Ley Creek Sub-site [Member] | Unfavorable Regulatory Action [Member] | Other Noncurrent Assets [Member]        
Recorded Third-Party Environmental Recoveries, Noncurrent   400 $ 400  
Lower Ley Creek Sub-site [Member] | Unfavorable Regulatory Action [Member] | Motors Liquidation Company [Member]        
Loss Contingency, Damages Paid, Value   22,000    
Lower Ley Creek Sub-site [Member] | Minimum [Member] | Unfavorable Regulatory Action [Member]        
Site Contingency, Loss Exposure Not Accrued, Best Estimate   17,000    
Loss Contingency, Estimate of Possible Loss   0    
Lower Ley Creek Sub-site [Member] | Maximum [Member] | Unfavorable Regulatory Action [Member]        
Site Contingency, Loss Exposure Not Accrued, Best Estimate   24,800    
Lower Ley Creek Sub-site [Member] | Syracuse China Company [Member]        
Site Contingency Number of Potentially Responsible Parties 1      
Upper Ley Creek Sub-site [Member] | Minimum [Member]        
Loss Contingency, Number of Companies Involved       30
Upper Ley Creek Sub-site [Member] | Syracuse China Company and Libbey Glass Inc. [Member]        
Site Contingency, Loss Exposure Not Accrued, Best Estimate   $ 93,500