Summary of Significant Accounting Policies - Disaggregated revenues below by products/services and geography (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Revenue from External Customer [Line Items]
Total sales	$ 49,208	$ 61,793
Product
Revenue from External Customer [Line Items]
Sales	35,206	47,906
Total sales	35,226	47,989
Services
Revenue from External Customer [Line Items]
Sales	13,982	13,804
Total sales	13,982	13,804
Finance
Revenue from External Customer [Line Items]
Finance	20	83
High Performance Products Segment
Revenue from External Customer [Line Items]
Total sales	4,623	5,876
High Performance Products Segment | Product
Revenue from External Customer [Line Items]
Sales	3,126	3,401
Total sales	3,126	3,401
High Performance Products Segment | Services
Revenue from External Customer [Line Items]
Sales	1,497	2,475
Total sales	1,497	2,475
TS
Revenue from External Customer [Line Items]
Total sales	44,585	55,917
TS | Product
Revenue from External Customer [Line Items]
Sales	32,080	44,505
Total sales	32,100	44,588
TS | Services
Revenue from External Customer [Line Items]
Sales	12,485	11,329
Total sales	12,485	11,329
TS | Finance
Revenue from External Customer [Line Items]
Finance	20	83
TS | U.K.
Revenue from External Customer [Line Items]
Total sales	2,004	1,383
TS | U.K. | Product
Revenue from External Customer [Line Items]
Sales	1,578	943
Total sales	1,578	943
TS | U.K. | Services
Revenue from External Customer [Line Items]
Sales	426	440
Total sales	426	440
TS | U.S.
Revenue from External Customer [Line Items]
Total sales	42,581	54,534
TS | U.S. | Product
Revenue from External Customer [Line Items]
Sales	30,502	43,562
Total sales	30,522	43,645
TS | U.S. | Services
Revenue from External Customer [Line Items]
Sales	12,059	10,889
Total sales	12,059	10,889
TS | U.S. | Finance
Revenue from External Customer [Line Items]
Finance	$ 20	$ 83