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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
3 Months Ended 9 Months Ended
Dec. 31, 2015
Mar. 31, 2017
Mar. 31, 2016
Jun. 30, 2016
Total   $ 153,815 $ 13,700  
Goodwill   $ 237,751   $ 157,354
Wisconsin-based Northlake Engineering, Inc [Member]        
Cash payments $ 14,015      
Less: cash acquired (315)      
Total 13,700      
Current assets 2,810      
Property, plant, and equipment 1,407      
Identifiable intangible assets 6,824      
Goodwill 5,121      
Other non-current assets 158      
Liabilities assumed (2,620)      
Total $ 13,700