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Segment Information - Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2021
Segment Reporting Information [Line Items]      
Total sales $ 12,369 $ 11,388  
Sales:      
(Loss) income from operations (396) (537)  
Total assets 61,786 53,037 $ 62,974
Capital expenditures 137 33  
Depreciation and amortization 94 104  
High Performance Products Segment      
Segment Reporting Information [Line Items]      
Total sales 1,064 1,556  
Sales:      
(Loss) income from operations (1,005) (854)  
Total assets 9,056 9,192  
Capital expenditures 45 6  
Depreciation and amortization 35 48  
TS      
Segment Reporting Information [Line Items]      
Total sales 11,305 9,832  
Sales:      
(Loss) income from operations 609 317  
Total assets 52,730 43,845  
Capital expenditures 92 27  
Depreciation and amortization 59 56  
Product      
Segment Reporting Information [Line Items]      
Total sales 8,720 8,408  
Product | High Performance Products Segment      
Segment Reporting Information [Line Items]      
Total sales 720 1,176  
Product | TS      
Segment Reporting Information [Line Items]      
Total sales 8,000 7,232  
Services      
Segment Reporting Information [Line Items]      
Total sales 3,649 2,980  
Services | High Performance Products Segment      
Segment Reporting Information [Line Items]      
Total sales 344 380  
Services | TS      
Segment Reporting Information [Line Items]      
Total sales 3,305 2,600  
U.K. | TS      
Segment Reporting Information [Line Items]      
Total sales 155 1,490  
Sales:      
(Loss) income from operations (55) 31  
Total assets 9,397 10,675  
U.K. | Product | TS      
Segment Reporting Information [Line Items]      
Total sales 62 1,403  
U.K. | Services | TS      
Segment Reporting Information [Line Items]      
Total sales 93 87  
U.S. | TS      
Segment Reporting Information [Line Items]      
Total sales 11,150 8,342  
Sales:      
(Loss) income from operations 664 286  
Total assets 43,333 33,170  
Capital expenditures 92 27  
Depreciation and amortization 59 56  
U.S. | Product | TS      
Segment Reporting Information [Line Items]      
Total sales 7,938 5,829  
U.S. | Services | TS      
Segment Reporting Information [Line Items]      
Total sales $ 3,212 $ 2,513