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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 12 Months Ended
Oct. 01, 2015
Jun. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
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 $ 2,810    
Property, plant, and equipment   1,407 1,407    
Identifiable intangible assets   4,124 4,124    
Goodwill   7,821 7,821    
Other non-current assets   158 158    
Liabilities assumed   (2,620) (2,620)    
Expected final payments   (156) (156)    
Total   13,544 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 2,700    
Goodwill   (2,700) (2,700)    
Other non-current assets      
Liabilities assumed      
Expected final payments   156 156    
Total   156 156    
Wisconsin-based Northlake Engineering, Inc [Member]          
Cash payments   14,015      
Less: cash acquired   (315)      
Total $ 13,700 13,700      
Current assets   2,810 2,810    
Property, plant, and equipment   1,407 1,407    
Identifiable intangible assets 6,800 6,824 6,824    
Goodwill $ 5,100 5,121 5,121    
Other non-current assets   158 158    
Liabilities assumed   (2,620) (2,620)    
Expected final payments      
Total   13,700 13,700    
Total     13,700 $ 57,149 $ 23,075
Goodwill   $ 157,354 $ 157,354 $ 154,732 $ 125,965