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Note 2 - Acquisitions (Details Textual) - USD ($)
$ in Thousands
9 Months Ended
Oct. 01, 2015
Jun. 30, 2016
Sep. 30, 2016
Wisconsin-based Northlake Engineering, Inc [Member] | Customer Relationships [Member]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 4,100    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 12 years 182 days    
Wisconsin-based Northlake Engineering, Inc [Member] | Noncompete Agreements [Member]      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 5 years    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 300    
Wisconsin-based Northlake Engineering, Inc [Member] | Trademarks [Member]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 2,400    
Wisconsin-based Northlake Engineering, Inc [Member]      
Payments to Acquire Businesses, Net of Cash Acquired $ 13,700 $ 13,700  
Business Acquisition, Percentage of Voting Interests Acquired 100.00%    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 6,800 6,824  
Goodwill $ 5,100 5,121  
Goodwill   $ 157,354 $ 157,062