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Acquisitions and Disposals (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Business Acquisition [Line Items]      
Proceeds from Divestiture of Businesses $ 0 $ 3,885 $ 0
Gain (Loss) on Disposition of Business $ 0 427 $ 0
Process Heating Equipment Business [Member]      
Business Acquisition [Line Items]      
Proceeds from Divestiture of Businesses   3,900  
Adjustment for Final Working Capital Settlement   200  
Gain (Loss) on Disposition of Business   $ 400