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Supplemental Financial Information - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss)    
Balance $ 63,635 $ 49,871
Balance 68,840 63,635
Foreign Currency Items    
Accumulated Other Comprehensive Income (Loss)    
Balance 752 990
Other comprehensive loss 1,705 (238)
Balance 2,457 752
Change in Defined Pension Benefit Obligation    
Accumulated Other Comprehensive Income (Loss)    
Balance (1,236) (1,000)
Other comprehensive loss 872 (236)
Balance (364) (1,236)
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss)    
Balance (484) (10)
Other comprehensive loss 2,577 (474)
Balance $ 2,093 $ (484)