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Note 1 - Summary of Significant Accounting Policies and Other Information (Details Textual)
$ in Thousands, € in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Jan. 02, 2016
USD ($)
Dec. 27, 2014
USD ($)
Dec. 31, 2016
EUR (€)
Oct. 02, 2016
USD ($)
Jan. 02, 2016
EUR (€)
Number of Reportable Segments 7          
Finite-Lived Intangible Asset, Useful Life 12 years 328 days 12 years 146 days        
Defined Benefit Plan, Purchases, Sales, and Settlements $ 29,900          
Advertising Expense 2,900 $ 2,300 $ 2,800      
Shipping, Handling and Transportation Costs 9,100 7,000 6,700      
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax (500) 1,500 $ (3,900)      
Loss Contingency, Accrual, Noncurrent $ 1,500 $ 2,000   € 1.4   € 1.8
Patents, Licenses, and Software [Member]            
Finite-Lived Intangible Asset, Useful Life 11 years 146 days 11 years 219 days        
Distribution Rights [Member]            
Finite-Lived Intangible Asset, Useful Life 12 years 36 days 12 years 146 days        
Industrial [Member] | Custom Products Reporting Unit [Member]            
Goodwill, Impairment Loss $ 8,800          
Impairment of Intangible Assets (Excluding Goodwill) 6,000          
Industrial [Member] | Custom Products Reporting Unit [Member] | Trade Names [Member]            
Impairment of Intangible Assets (Excluding Goodwill) 3,800          
Intangible Assets, Net (Excluding Goodwill) 700          
Industrial [Member] | Custom Products Reporting Unit [Member] | Customer Relationships [Member]            
Impairment of Intangible Assets (Excluding Goodwill) 2,200          
Intangible Assets, Net (Excluding Goodwill) $ 0          
Electronics Non Silicon Unit [Member]            
Excess Of Fair Value Over Carrying Value Of Invested Capital         65.00%  
Electronics (Silicon) Unit [Member]            
Excess Of Fair Value Over Carrying Value Of Invested Capital         154.00%  
Passenger Car [Member]            
Excess Of Fair Value Over Carrying Value Of Invested Capital         218.00%  
Commercial Vehicle Products [Member]            
Excess Of Fair Value Over Carrying Value Of Invested Capital         132.00%  
Sensors [Member]            
Excess Of Fair Value Over Carrying Value Of Invested Capital         70.00%  
Relay Unit [Member]            
Excess Of Fair Value Over Carrying Value Of Invested Capital         15.00%  
Fair Value Inputs, Discount Rate 10.30%          
Fair Value Inputs, Comparability Adjustments 0.50%          
Intangible Assets, Net (Including Goodwill)         $ 41,400  
Fuse Unit [Member]            
Excess Of Fair Value Over Carrying Value Of Invested Capital         150.00%  
All Reporting Units Other Than Relay Unit [Member]            
Fair Value Inputs, Discount Rate 9.80%          
Fair Value Inputs, Long-term Revenue Growth Rate 3.00%          
Minimum [Member] | Trademarks and Trade Names [Member]            
Finite-Lived Intangible Asset, Useful Life 5 years          
Minimum [Member] | Patents, Licenses, and Software [Member]            
Finite-Lived Intangible Asset, Useful Life 5 years          
Minimum [Member] | Distribution Rights [Member]            
Finite-Lived Intangible Asset, Useful Life 3 years          
Maximum [Member] | Trademarks and Trade Names [Member]            
Finite-Lived Intangible Asset, Useful Life 20 years          
Maximum [Member] | Patents, Licenses, and Software [Member]            
Finite-Lived Intangible Asset, Useful Life 17 years          
Maximum [Member] | Distribution Rights [Member]            
Finite-Lived Intangible Asset, Useful Life 20 years          
Building [Member]            
Property, Plant and Equipment, Useful Life 21 years          
Equipment [Member] | Minimum [Member]            
Property, Plant and Equipment, Useful Life 7 years          
Equipment [Member] | Maximum [Member]            
Property, Plant and Equipment, Useful Life 9 years          
Furniture and Fixtures [Member]            
Property, Plant and Equipment, Useful Life 7 years          
Tooling [Member]            
Property, Plant and Equipment, Useful Life 5 years          
Computer Equipment [Member]            
Property, Plant and Equipment, Useful Life 3 years          
Polytronics [Member]            
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 7.20% 7.20%   7.20%   7.20%
Marketable Securities, Equity Securities $ 10,400 $ 11,700   € 10.0   € 10.7
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax $ (800) 900        
Monolith [Member]            
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 12.00%     12.00%    
Cost Method Investments $ 3,500          
Cost Method Investments, Fair Value Disclosure $ 3,500 $ 3,500