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Note 2 - Acquisition - Components of Fair Value of Acquisitions and Allocation of Purchase Price (Details) - USD ($)
$ in Thousands
 9 Months Ended
Oct. 01, 2015
Jun. 30, 2016
Sep. 30, 2016
Wisconsin-based Northlake Engineering, Inc [Member] | Scenario, Previously Reported [Member]      
Cash payments   $ 13,859  
Less: cash acquired   (315)  
Total   13,544  
Current assets   2,810  
Property, plant, and equipment   1,407  
Identifiable intangible assets   4,124  
Goodwill   7,821  
Other non-current assets   158  
Liabilities assumed   (2,620)  
Expected final payments   (156)  
Total   13,544  
Wisconsin-based Northlake Engineering, Inc [Member] | Restatement Adjustment [Member]      
Cash payments   156  
Less: cash acquired    
Total   156  
Current assets    
Property, plant, and equipment    
Identifiable intangible assets   2,700  
Goodwill   (2,700)  
Other non-current assets    
Liabilities assumed    
Expected final payments   156  
Total   156  
Wisconsin-based Northlake Engineering, Inc [Member]      
Cash payments   14,015  
Less: cash acquired   (315)  
Total $ 13,700 13,700  
Current assets   2,810  
Property, plant, and equipment   1,407  
Identifiable intangible assets 6,800 6,824  
Goodwill $ 5,100 5,121  
Other non-current assets   158  
Liabilities assumed   (2,620)  
Expected final payments    
Total   13,700  
Goodwill   $ 157,354 $ 157,062