Segment Information - Operating Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Sales	$ 79,061	$ 72,916
Sales:
Income (loss) from operations	(826)	(1,601)
Total assets	59,369	55,275
Capital expenditures	832	438
Depreciation and amortization	416	625
High Performance Products Segment
Segment Reporting Information [Line Items]
Sales	7,902	10,479
Sales:
Income (loss) from operations	(3,085)	(2,777)
Total assets	11,548	14,869
Capital expenditures	310	99
Depreciation and amortization	230	243
United Kingdom
Segment Reporting Information [Line Items]
Sales	5,316	8,107
Sales:
Income (loss) from operations	(62)	(475)
Total assets	10,530	13,854
Capital expenditures	6	1
Depreciation and amortization	6	7
U.S.
Segment Reporting Information [Line Items]
Sales	65,843	54,330
Sales:
Income (loss) from operations	2,321	1,651
Total assets	37,291	26,552
Capital expenditures	516	338
Depreciation and amortization	180	375
TS
Segment Reporting Information [Line Items]
Sales	71,159	62,437
Sales:
Income (loss) from operations	2,259	1,176
Total assets	47,821	40,406
Capital expenditures	522	339
Depreciation and amortization	186	382
Product
Segment Reporting Information [Line Items]
Sales	66,017	59,661
Product | High Performance Products Segment
Segment Reporting Information [Line Items]
Sales	6,406	7,014
Product | United Kingdom
Segment Reporting Information [Line Items]
Sales	4,936	7,501
Product | U.S.
Segment Reporting Information [Line Items]
Sales	54,675	45,146
Product | TS
Segment Reporting Information [Line Items]
Sales	59,611	52,647
Service
Segment Reporting Information [Line Items]
Sales	13,044	13,255
Service | High Performance Products Segment
Segment Reporting Information [Line Items]
Sales	1,496	3,465
Service | United Kingdom
Segment Reporting Information [Line Items]
Sales	380	606
Service | U.S.
Segment Reporting Information [Line Items]
Sales	11,168	9,184
Service | TS
Segment Reporting Information [Line Items]
Sales	$ 11,548	$ 9,790