Consolidated Condensed Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 3,260	$ (1,258)	$ 1,919	$ (2,540)
Other comprehensive income (loss):
Foreign currency translation adjustment	(130)	(159)	63	(587)
Retirement plan liability adjustment	249	107	437	215
Comprehensive income (loss)	$ 3,379	$ (1,310)	$ 2,419	$ (2,912)