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Income Taxes - Tax effects of significant temporary differences of deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Deferred tax assets:        
Employee related accruals $ 6,337 $ 5,703    
Inventory 2,094 726    
Environmental remediation 765 974    
Net operating loss carry forwards-domestic 1,522 1,618    
Net operating loss carry forwards-foreign 5,517 5,221    
Operating lease liabilities 8,312 5,732    
Other 4,672 6,340    
Deferred tax assets, gross 29,219 26,314    
Valuation allowance (3,709) (3,403) $ (808) $ (861)
Deferred tax assets, net of valuation allowance 25,510 22,911    
Deferred tax liabilities:        
Property, plant and equipment and intangible assets (7,550) (6,108)    
Operating lease ROU assets (8,251) (5,657)    
Other (793) (921)    
Deferred tax liabilities, net (16,594) (12,686)    
Net deferred tax asset $ 8,916 $ 10,225