Segment Information - Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018
Segment Reporting Information [Line Items]
Sales	$ 21,570	$ 20,044	$ 56,900	$ 53,278
Sales:
Income (loss) from operations	145	222	(611)	(476)
Assets from continuing operations	56,492	58,958	56,492	58,958	$ 55,275
Assets from discontinued operations		16,263		16,263
Capital expenditures	322	86	590	262
Depreciation and amortization	103	147	309	398
High Performance Products Segment
Segment Reporting Information [Line Items]
Sales	2,140	3,087	5,780	7,352
Sales:
Income (loss) from operations	(484)	(43)	(2,404)	(1,482)
Assets from continuing operations	12,287	15,018	12,287	15,018
Capital expenditures	39	34	279	80
Depreciation and amortization	58	75	166	188
United Kingdom
Segment Reporting Information [Line Items]
Sales	829	2,210	4,614	5,788
Sales:
Income (loss) from operations	(25)	14	107	(77)
Assets from continuing operations	12,540	4,769	12,540	4,769
Depreciation and amortization		1	3	3
U.S.
Segment Reporting Information [Line Items]
Sales	18,601	14,747	46,506	40,138
Sales:
Income (loss) from operations	654	251	1,686	1,083
Assets from continuing operations	31,665	22,908	31,665	22,908
Capital expenditures	283	52	311	182
Depreciation and amortization	45	71	140	207
Total
Segment Reporting Information [Line Items]
Sales	19,430	16,957	51,120	45,926
Sales:
Income (loss) from operations	629	265	1,793	1,006
Assets from continuing operations	44,205	27,677	44,205	27,677
Capital expenditures	283	52	311	182
Depreciation and amortization	45	72	143	210
Continuing Operations
Sales:
Assets from continuing operations		42,695		42,695
Continuing Operations | High Performance Products Segment
Sales:
Assets from continuing operations		15,018		15,018
Continuing Operations | United Kingdom
Sales:
Assets from continuing operations		4,769		4,769
Continuing Operations | U.S.
Sales:
Assets from continuing operations		22,908		22,908
Continuing Operations | Total
Sales:
Assets from continuing operations		27,677		27,677
Product
Segment Reporting Information [Line Items]
Sales	18,076	16,080	47,390	43,798
Product | High Performance Products Segment
Segment Reporting Information [Line Items]
Sales	1,592	1,665	4,700	4,752
Product | United Kingdom
Segment Reporting Information [Line Items]
Sales	720	1,978	4,340	5,276
Product | U.S.
Segment Reporting Information [Line Items]
Sales	15,764	12,437	38,350	33,770
Product | Total
Segment Reporting Information [Line Items]
Sales	16,484	14,415	42,690	39,046
Service
Segment Reporting Information [Line Items]
Sales	3,494	3,964	9,510	9,480
Service | High Performance Products Segment
Segment Reporting Information [Line Items]
Sales	548	1,422	1,080	2,600
Service | United Kingdom
Segment Reporting Information [Line Items]
Sales	109	232	274	512
Service | U.S.
Segment Reporting Information [Line Items]
Sales	2,837	2,310	8,156	6,368
Service | Total
Segment Reporting Information [Line Items]
Sales	$ 2,946	$ 2,542	$ 8,430	$ 6,880