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Segment Information (Detail) - The following table presents certain operating segment information - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018
Sales:
Product	$ 15,711	$ 13,669
Service	3,269	2,961
Total sales	18,980	16,630
Income (loss) from operations	15	165
Assets from continuing operations	54,595	59,917	$ 55,275
Disposal Group, Including Discontinued Operation, Assets		21,000
Capital expenditures	233	44
Depreciation and amortization	106	124
High Performance Products Segment
Sales:
Product	1,733	1,607
Service	293	863
Total sales	2,026	2,470
Income (loss) from operations	(827)	(382)
Assets from continuing operations	14,059	16,613
Capital expenditures	203	10
Depreciation and amortization	53	56
United Kingdom
Sales:
Product	1,732	2,542
Service	70	165
Total sales	1,802	2,707
Income (loss) from operations	26	142
Assets from continuing operations	13,110	2,520
Capital expenditures	0	0
Depreciation and amortization	2	1
U.S.
Sales:
Product	12,246	9,520
Service	2,906	1,933
Total sales	15,152	11,453
Income (loss) from operations	816	405
Assets from continuing operations	27,426	19,784
Capital expenditures	30	34
Depreciation and amortization	51	67
Total
Sales:
Product	13,978	12,062
Service	2,976	2,098
Total sales	16,954	14,160
Income (loss) from operations	842	547
Assets from continuing operations	40,536	22,304
Capital expenditures	30	34
Depreciation and amortization	$ 53	68
Continuing Operations
Sales:
Assets from continuing operations		38,917
Continuing Operations | High Performance Products Segment
Sales:
Assets from continuing operations		16,613
Continuing Operations | United Kingdom
Sales:
Assets from continuing operations		2,520
Continuing Operations | U.S.
Sales:
Assets from continuing operations		19,784
Continuing Operations | Total
Sales:
Assets from continuing operations		$ 22,304

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