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Segment Information - Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2019
Segment Reporting Information [Line Items]
Sales	$ 13,532	$ 21,570	$ 46,199	$ 56,900
Sales:
Income (loss) from operations	(393)	145	(938)	(611)
Total assets	54,261	56,492	54,261	56,492	$ 59,369
Capital expenditures	45	322	285	590
Depreciation and amortization	113	103	352	309
High Performance Products Segment
Segment Reporting Information [Line Items]
Sales	1,583	2,140	4,099	5,780
Sales:
Income (loss) from operations	(765)	(484)	(3,052)	(2,404)
Total assets	9,046	12,287	9,046	12,287
Capital expenditures		39	63	279
Depreciation and amortization	50	58	165	166
TS
Segment Reporting Information [Line Items]
Sales	11,949	19,430	42,100	51,120
Sales:
Income (loss) from operations	372	629	2,114	1,793
Total assets	45,215	44,205	45,215	44,205
Capital expenditures	45	283	222	311
Depreciation and amortization	63	45	187	143
Product
Segment Reporting Information [Line Items]
Sales	10,294	18,076	35,812	47,390
Product | High Performance Products Segment
Segment Reporting Information [Line Items]
Sales	780	1,592	2,469	4,700
Product | TS
Segment Reporting Information [Line Items]
Sales	9,514	16,484	33,343	42,690
Service
Segment Reporting Information [Line Items]
Sales	3,238	3,494	10,387	9,510
Service | High Performance Products Segment
Segment Reporting Information [Line Items]
Sales	803	548	1,630	1,080
Service | TS
Segment Reporting Information [Line Items]
Sales	2,435	2,946	8,757	8,430
U.K. | TS
Segment Reporting Information [Line Items]
Sales	207	829	1,154	4,614
Sales:
Income (loss) from operations	32	(25)	(15)	107
Total assets	10,729	12,540	10,729	12,540
Depreciation and amortization			3	3
U.K. | Product | TS
Segment Reporting Information [Line Items]
Sales	75	720	812	4,340
U.K. | Service | TS
Segment Reporting Information [Line Items]
Sales	132	109	342	274
U.S. | TS
Segment Reporting Information [Line Items]
Sales	11,742	18,601	40,946	46,506
Sales:
Income (loss) from operations	340	654	2,129	1,686
Total assets	34,486	31,665	34,486	31,665
Capital expenditures	45	283	222	311
Depreciation and amortization	63	45	184	140
U.S. | Product | TS
Segment Reporting Information [Line Items]
Sales	9,439	15,764	32,531	38,350
U.S. | Service | TS
Segment Reporting Information [Line Items]
Sales	$ 2,303	$ 2,837	$ 8,415	$ 8,156

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