Segment Information - Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2019
Segment Reporting Information [Line Items]
Sales	$ 16,572	$ 18,980
Sales:
Income (loss) from operations	(402)	15
Total assets	56,248	54,595	$ 59,369
Capital expenditures	207	233
Depreciation and amortization	125	106
High Performance Products Segment
Segment Reporting Information [Line Items]
Sales	1,041	2,026
Sales:
Income (loss) from operations	(1,263)	(827)
Total assets	10,496	14,059
Capital expenditures	34	203
Depreciation and amortization	58	53
TS
Segment Reporting Information [Line Items]
Sales	15,531	16,954
Sales:
Income (loss) from operations	861	842
Total assets	45,752	40,536
Capital expenditures	173	30
Depreciation and amortization	67	53
Product
Segment Reporting Information [Line Items]
Sales	13,222	15,711
Product | High Performance Products Segment
Segment Reporting Information [Line Items]
Sales	767	1,733
Product | TS
Segment Reporting Information [Line Items]
Sales	12,455	13,978
Service
Segment Reporting Information [Line Items]
Sales	3,350	3,269
Service | High Performance Products Segment
Segment Reporting Information [Line Items]
Sales	274	293
Service | TS
Segment Reporting Information [Line Items]
Sales	3,076	2,976
U.K. | TS
Segment Reporting Information [Line Items]
Sales	679	1,802
Sales:
Income (loss) from operations	3	26
Total assets	10,847	13,110
Depreciation and amortization	3	2
U.K. | Product | TS
Segment Reporting Information [Line Items]
Sales	553	1,732
U.K. | Service | TS
Segment Reporting Information [Line Items]
Sales	126	70
U.S. | TS
Segment Reporting Information [Line Items]
Sales	14,852	15,152
Sales:
Income (loss) from operations	858	816
Total assets	34,905	27,426
Capital expenditures	173	30
Depreciation and amortization	64	51
U.S. | Product | TS
Segment Reporting Information [Line Items]
Sales	11,902	12,246
U.S. | Service | TS
Segment Reporting Information [Line Items]
Sales	$ 2,950	$ 2,906