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Note 5 - Investments (Details Textual)
€ in Millions, $ in Millions
3 Months Ended
Apr. 02, 2016
USD ($)
Apr. 02, 2016
EUR (€)
Apr. 02, 2016
USD ($)
Jan. 02, 2016
EUR (€)
Jan. 02, 2016
USD ($)
Polytronics [Member]          
Marketable Securities, Equity Securities   € 9.6 $ 10.9 € 10.7 $ 11.7
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax $ (1.3)        
Monolith [Member]          
Cost Method Investments         $ 3.5
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners       12.00% 12.00%
Cost Method Investments, Fair Value Disclosure     $ 3.5   $ 3.5