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Income Taxes - Components of Deferred Tax (Liabilities) Assets (Details) - USD ($)
$ in Thousands
Jun. 28, 2020
Jun. 30, 2019
Income Tax Disclosure [Abstract]    
Unrecognized pension and postretirement plan liabilities $ 617 $ 701
Accrued warranty 517 446
Payroll-related accruals 2,259 2,180
Stock-based compensation 389 470
Inventory reserve 964 834
Environmental reserve 296 300
Repair and maintenance supply parts reserve 510 229
Allowance for doubtful accounts 118 118
Lease liability 882  
Right of use assets (882)  
Credit carry-forwards 3,860 1,990
Postretirement obligations (357) (416)
Accumulated depreciation (5,063) (5,023)
Accrued pension obligations 472  
Accrued pension obligations   (1,578)
Non-cash compensation expense   986
Joint ventures 1,167 968
Other 741 728
Deferred tax assets, net $ 6,490 $ 2,933