Segment Information - Operating Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Total sales	$ 54,361	$ 49,208
Sales:
(Loss) income from operations	(40)	(1,362)
Interest income	650	575
Interest expense	(360)	(350)
Total assets	75,062	62,974
Capital expenditures	234	98
Depreciation and amortization	359	388
HPP
Segment Reporting Information [Line Items]
Total sales	3,843	4,623
Sales:
(Loss) income from operations	(4,888)	(4,578)
Interest income	40
Interest expense	(48)	(71)
Total assets	8,855	9,018
Capital expenditures	89	18
Depreciation and amortization	118	177
TS
Segment Reporting Information [Line Items]
Total sales	50,518	44,585
Sales:
(Loss) income from operations	4,848	3,216
Interest income	610	575
Interest expense	(312)	(279)
Total assets	66,207	53,956
Capital expenditures	145	80
Depreciation and amortization	241	211
Product
Segment Reporting Information [Line Items]
Total sales	36,688	35,226
Product | HPP
Segment Reporting Information [Line Items]
Total sales	2,516	3,126
Product | TS
Segment Reporting Information [Line Items]
Total sales	34,172	32,100
Service
Segment Reporting Information [Line Items]
Total sales	17,673	13,982
Service | HPP
Segment Reporting Information [Line Items]
Total sales	1,327	1,497
Service | TS
Segment Reporting Information [Line Items]
Total sales	16,346	12,485
U.K.. | TS
Segment Reporting Information [Line Items]
Total sales	843	2,004
Sales:
(Loss) income from operations	(204)	(217)
Interest income	53	27
Total assets	10,069	10,174
U.K.. | Product | TS
Segment Reporting Information [Line Items]
Total sales	518	1,578
U.K.. | Service | TS
Segment Reporting Information [Line Items]
Total sales	325	426
UNITED STATES | TS
Segment Reporting Information [Line Items]
Total sales	49,675	42,581
Sales:
(Loss) income from operations	5,052	3,433
Interest income	557	548
Interest expense	(312)	(279)
Total assets	56,138	43,782
Capital expenditures	145	80
Depreciation and amortization	241	211
UNITED STATES | Product | TS
Segment Reporting Information [Line Items]
Total sales	33,654	30,522
UNITED STATES | Service | TS
Segment Reporting Information [Line Items]
Total sales	$ 16,021	$ 12,059