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Derivatives (Detail Textuals) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Derivative [Line Items]    
Unrecognized gains on derivative instruments recorded in earnings within the next twelve months $ 1,759  
Options | Cash flow hedges    
Derivative [Line Items]    
Other comprehensive income (loss), unrealized gains (losses) on derivatives 31  
Options | Cash flow hedges | Cost of goods sold    
Derivative [Line Items]    
Realized gain (losses) on derivative instruments 1,011 $ (1,528)
Options | Cash flow hedges | Other comprehensive income (loss)    
Derivative [Line Items]    
Unrecognized gains (losses) on derivative instruments $ 2,686