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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Sep. 30, 2021
Changes in foreign currency translation          
Beginning accumulated foreign currency translation $ 249 $ 226 $ 262 $ 545  
Change in cumulative translation adjustment before reclassifications (108) (74) (121) (393)  
Income taxes 0 0 0 0  
Net current period other comprehensive loss (108) (74) (121) (393)  
Ending accumulated foreign currency translation 141 152 141 152  
Changes in retirement plans          
Beginning accumulated retirement plans benefit cost (230) (1,914) (230) (1,980)  
Amortization of net actuarial loss 0 26 0 92  
Gain on termination of post-retirement medical plan 0 541 0 541  
Income taxes 0 0 0 0  
Net current period other comprehensive income 0 567 0 633  
Ending accumulated retirement plans benefit cost (230) (1,347) (230) (1,347)  
Accumulated other comprehensive loss, net of taxes $ (89) $ (1,195) $ (89) $ (1,195) $ 32