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Segment Information - Operating Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information [Line Items]    
Total sales $ 49,208 $ 61,793
Sales:    
Income (loss) from operations (1,362) (1,424)
Total assets 62,974 53,645
Capital expenditures 98 230
Depreciation and amortization 388 452
High Performance Products Segment    
Segment Reporting Information [Line Items]    
Total sales 4,623 5,876
Sales:    
Income (loss) from operations (4,578) (3,730)
Total assets 9,018 9,915
Capital expenditures 18 89
Depreciation and amortization 177 218
TS    
Segment Reporting Information [Line Items]    
Total sales 44,585 55,917
Sales:    
Income (loss) from operations 3,216 2,306
Total assets 53,956 43,730
Capital expenditures 80 141
Depreciation and amortization 211 234
Product    
Segment Reporting Information [Line Items]    
Total sales 35,226 47,989
Product | High Performance Products Segment    
Segment Reporting Information [Line Items]    
Total sales 3,126 3,401
Product | TS    
Segment Reporting Information [Line Items]    
Total sales 32,100 44,588
Services    
Segment Reporting Information [Line Items]    
Total sales 13,982 13,804
Services | High Performance Products Segment    
Segment Reporting Information [Line Items]    
Total sales 1,497 2,475
Services | TS    
Segment Reporting Information [Line Items]    
Total sales 12,485 11,329
U.K. | TS    
Segment Reporting Information [Line Items]    
Total sales 2,004 1,383
Sales:    
Income (loss) from operations (217) (168)
Total assets 10,174 10,296
Depreciation and amortization   3
U.K. | Product | TS    
Segment Reporting Information [Line Items]    
Total sales 1,578 943
U.K. | Services | TS    
Segment Reporting Information [Line Items]    
Total sales 426 440
U.S. | TS    
Segment Reporting Information [Line Items]    
Total sales 42,581 54,534
Sales:    
Income (loss) from operations 3,433 2,474
Total assets 43,782 33,434
Capital expenditures 80 141
Depreciation and amortization 211 231
U.S. | Product | TS    
Segment Reporting Information [Line Items]    
Total sales 30,522 43,645
U.S. | Services | TS    
Segment Reporting Information [Line Items]    
Total sales $ 12,059 $ 10,889