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Note 2 - Acquisitions - Components of Fair Value of Acquisitions and Allocation of Purchase Price For Acquisition of Northlake (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Oct. 01, 2015
Jun. 30, 2016
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Total     $ 10,397 $ 153,815 $ 13,700
Goodwill   $ 157,354 $ 251,762 $ 242,690 157,354
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)
Total   $ 13,700     $ 13,700