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Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jun. 30, 2020
Payables and Accruals [Abstract]    
Accrued postretirement benefits $ 541 $ 744
Accrued workers’ compensation liabilities 1,415 1,466
Liability, Defined Benefit Plan, Current 1,763 1,477
Other (including net taxes payable) 3,770 3,115
Other current liabilities $ 7,489 $ 6,802