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Note 3 - Goodwill and Other Intangible Assets (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Jun. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Oct. 31, 2020
Dec. 31, 2017
Goodwill, Impairment Loss $ 51,000   $ 51,000 $ 6,000    
Impairment of Intangible Assets, Finite-lived     0 0    
Intangible Assets, Net (Excluding Goodwill), Total     236,000 240,000    
Light Vehicle Segment [Member]            
Goodwill, Impairment Loss     3,000      
Intangible Assets, Net (Excluding Goodwill), Total     22,000      
Commercial Vehicle Segment [Member]            
Goodwill, Impairment Loss $ 48,000   48,000      
Intangible Assets, Net (Excluding Goodwill), Total     68,000      
Off-Highway Segment [Member]            
Intangible Assets, Net (Excluding Goodwill), Total     139,000      
Power Technologies Segment [Member]            
Goodwill, Impairment Loss       6,000    
Intangible Assets, Net (Excluding Goodwill), Total     7,000      
Trademarks and Trade Names [Member]            
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)     $ 0 $ 0    
Used in Research and Development [Member]            
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   $ 20,000        
Indefinite Lived Intangible Assets, Excluding Goodwill, Gross           $ 20,000
Off-Highway Reporting Unit [Member]            
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount         14.00%  
Reporting Unit, Valuation, Discount Rate         12.00%  
Reporting Unit, Valuation, Discount Rate Required to Result in Fair Value Equal to Carrying Amount         13.60%  
Commercial Vehicle Reporting Unit [Member]            
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount         4.00%  
Reporting Unit, Valuation, Discount Rate         14.00%  
Reporting Unit, Valuation, Discount Rate Required to Result in Fair Value Equal to Carrying Amount         14.70%