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Segment Information - Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Segment Reporting Information [Line Items]          
Total sales $ 13,721 $ 13,780 $ 39,197 $ 47,521  
Sales:          
Income (loss) from operations (357) (393) (1,015) (938)  
Total assets 60,556 54,261 60,556 54,261 $ 53,645
Capital expenditures 41 45 84 285  
Depreciation and amortization 91 113 293 352  
High Performance Products Segment          
Segment Reporting Information [Line Items]          
Total sales 958 1,583 3,402 4,099  
Sales:          
Income (loss) from operations (1,372) (765) (3,565) (3,052)  
Total assets 8,501 9,046 8,501 9,046  
Capital expenditures 11   18 63  
Depreciation and amortization 41 50 134 165  
TS          
Segment Reporting Information [Line Items]          
Total sales 12,763 12,197 35,795 43,422  
Sales:          
Income (loss) from operations 1,015 372 2,550 2,114  
Total assets 52,055 45,215 52,055 45,215  
Capital expenditures 30 45 66 222  
Depreciation and amortization 50 63 159 187  
Product          
Segment Reporting Information [Line Items]          
Total sales 10,142 10,399 29,526 37,104  
Product | High Performance Products Segment          
Segment Reporting Information [Line Items]          
Total sales 602 780 2,494 2,469  
Product | TS          
Segment Reporting Information [Line Items]          
Total sales 9,540 9,619 27,032 34,635  
Service          
Segment Reporting Information [Line Items]          
Total sales 3,579 3,381 9,671 10,417  
Service | High Performance Products Segment          
Segment Reporting Information [Line Items]          
Total sales 356 803 908 1,630  
Service | TS          
Segment Reporting Information [Line Items]          
Total sales 3,223 2,578 8,763 8,787  
U.K. | TS          
Segment Reporting Information [Line Items]          
Total sales 213 207 2,034 1,154  
Sales:          
Income (loss) from operations (95) 32 (130) (15)  
Total assets 9,942 10,729 9,942 10,729  
Depreciation and amortization       3  
U.K. | Product | TS          
Segment Reporting Information [Line Items]          
Total sales 130 75 1,774 812  
U.K. | Service | TS          
Segment Reporting Information [Line Items]          
Total sales 83 132 260 342  
U.S. | TS          
Segment Reporting Information [Line Items]          
Total sales 12,550 11,990 33,761 42,268  
Sales:          
Income (loss) from operations 1,110 340 2,680 2,129  
Total assets 42,113 34,486 42,113 34,486  
Capital expenditures 30 45 66 222  
Depreciation and amortization 50 63 159 184  
U.S. | Product | TS          
Segment Reporting Information [Line Items]          
Total sales 9,410 9,544 25,258 33,823  
U.S. | Service | TS          
Segment Reporting Information [Line Items]          
Total sales $ 3,140 $ 2,446 $ 8,503 $ 8,445