ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022
Changes in foreign currency translation
Beginning accumulated foreign currency translation	$ 224	$ 249	$ 222	$ 262
Change in cumulative translation adjustment before reclassifications	15	(108)	17	(121)
Income taxes	0	0	0	0
Net current period other comprehensive income (loss)	15	(108)	17	(121)
Ending accumulated foreign currency translation	239	141	239	141
Changes in retirement plans
Beginning accumulated retirement plans benefit income (cost)	1,032	(230)	1,072	(230)
Amortization of net actuarial gain	(20)	0	(60)	0
Income taxes	0	0	0	0
Net current period other comprehensive loss	(20)	0	(60)	0
Ending accumulated retirement plans benefit income (cost)	1,012	(230)	1,012	(230)
Accumulated other comprehensive income (loss), net of taxes	$ 1,251	$ (89)	$ 1,251	$ (89)	$ 1,294