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Income Taxes - Tax effects of significant temporary differences of deferred tax assets and liabilities (Details 3) - USD ($)
$ in Thousands
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Deferred tax assets:        
Employee related accruals $ 5,735 $ 4,952    
Inventory 4,766 3,953    
Environmental remediation 1,128 1,341    
Net operating loss carry forwards-domestic 902 1,577    
Net operating loss carry forwards-foreign 3,703 3,243    
Other 6,302 9,986    
Deferred tax assets, gross 22,536 25,052    
Valuation allowance (808) (861) $ (438) $ (4,614)
Deferred tax assets, net of valuation allowance 21,728 24,191    
Deferred tax liabilities:        
Property, plant and equipment and intangible assets (6,071) (8,957)    
Other liabilities (772) (1,906)    
Deferred tax liabilities, net (6,843) (10,863)    
Net deferred tax asset $ 14,885 $ 13,328