Consolidated Condensed Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 2,250	$ (7,370)	$ 4,168	$ (9,911)
Other comprehensive income (loss):
Foreign currency translation adjustment	113	146	175	(441)
Retirement plan liability adjustment	188	108	626	322
Comprehensive income (loss)	$ 2,551	$ (7,116)	$ 4,969	$ (10,030)