Segment Information - Operating Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Total sales	$ 64,647	$ 54,361
Operating (loss) income	1,870	(40)
Interest income	1,460	650
Interest expense	(262)	(360)
Total assets	65,904	75,062
Capital expenditures	(226)	(234)
Depreciation and amortization	(358)	(359)
HPP
Segment Reporting Information [Line Items]
Total sales	6,873	3,843
Operating (loss) income	(2,708)	(4,888)
Interest income	20	40
Interest expense	(12)	(48)
Total assets	10,467	8,855
Capital expenditures	(75)	(89)
Depreciation and amortization	(112)	(118)
TS
Segment Reporting Information [Line Items]
Total sales	57,774	50,518
Operating (loss) income	4,578	4,848
Interest income	1,440	610
Interest expense	(250)	(312)
Total assets	55,437	66,207
Capital expenditures	(151)	(145)
Depreciation and amortization	(246)	(241)
Product
Segment Reporting Information [Line Items]
Total sales	47,149	36,688
Product | HPP
Segment Reporting Information [Line Items]
Total sales	5,475	2,516
Product | TS
Segment Reporting Information [Line Items]
Total sales	41,674	34,172
Service
Segment Reporting Information [Line Items]
Total sales	17,498	17,673
Service | HPP
Segment Reporting Information [Line Items]
Total sales	1,398	1,327
Service | TS
Segment Reporting Information [Line Items]
Total sales	16,100	16,346
U.K.. | TS
Segment Reporting Information [Line Items]
Total sales	1,022	843
Operating (loss) income	(64)	(204)
Interest income	177	53
Interest expense	0	0
Total assets	7,361	10,069
Capital expenditures	0	0
Depreciation and amortization	0	0
U.K.. | Product | TS
Segment Reporting Information [Line Items]
Total sales	734	518
U.K.. | Service | TS
Segment Reporting Information [Line Items]
Total sales	288	325
UNITED STATES | TS
Segment Reporting Information [Line Items]
Total sales	56,752	49,675
Operating (loss) income	4,642	5,052
Interest income	1,263	557
Interest expense	(250)	(312)
Total assets	48,076	56,138
Capital expenditures	(151)	(145)
Depreciation and amortization	(246)	(241)
UNITED STATES | Product | TS
Segment Reporting Information [Line Items]
Total sales	40,940	33,654
UNITED STATES | Service | TS
Segment Reporting Information [Line Items]
Total sales	$ 15,812	$ 16,021