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Segment Information - Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Sep. 30, 2022
Segment Reporting Information [Line Items]          
Total sales $ 13,269 $ 11,981 $ 31,613 $ 24,350  
Sales:          
(Loss) income from operations 237 (24) 1,601 (420)  
Interest income 325 126 586 271  
Interest expense (62) (101) (126) (206)  
Total assets 66,024 58,430 66,024 58,430 $ 75,062
Capital expenditures 137 58 181 195  
Depreciation and amortization 88 86 178 180  
HPP          
Segment Reporting Information [Line Items]          
Total sales 1,476 1,143 3,965 2,207  
Sales:          
(Loss) income from operations (693) (1,102) (791) (2,107)  
Interest income 7 1 8 1  
Interest expense (3) (14) (6) (31)  
Total assets 8,695 8,756 8,695 8,756  
Capital expenditures 24 15 40 60  
Depreciation and amortization 27 28 56 63  
TS          
Segment Reporting Information [Line Items]          
Total sales 11,793 10,838 27,648 22,143  
Sales:          
(Loss) income from operations 930 1,078 2,392 1,687  
Interest income 318 125 578 270  
Interest expense (59) (87) (120) (175)  
Total assets 57,329 49,674 57,329 49,674  
Capital expenditures 113 43 141 135  
Depreciation and amortization 61 58 122 117  
Product          
Segment Reporting Information [Line Items]          
Total sales 8,988 8,217 23,209 16,937  
Product | HPP          
Segment Reporting Information [Line Items]          
Total sales 972 962 3,134 1,682  
Product | TS          
Segment Reporting Information [Line Items]          
Total sales 8,016 7,255 20,075 15,255  
Service          
Segment Reporting Information [Line Items]          
Total sales 4,281 3,764 8,404 7,413  
Service | HPP          
Segment Reporting Information [Line Items]          
Total sales 504 181 831 525  
Service | TS          
Segment Reporting Information [Line Items]          
Total sales 3,777 3,583 7,573 6,888  
U.K.. | TS          
Segment Reporting Information [Line Items]          
Total sales 267 316 545 471  
Sales:          
(Loss) income from operations (10) (36) 4 (91)  
Interest income 44 4 79 11  
Interest expense 0 0 0    
Total assets 6,930 9,161 6,930 9,161  
Capital expenditures 0 0 0 0  
Depreciation and amortization 0 0 0 0  
U.K.. | Product | TS          
Segment Reporting Information [Line Items]          
Total sales 175 212 366 274  
U.K.. | Service | TS          
Segment Reporting Information [Line Items]          
Total sales 92 104 179 197  
UNITED STATES | TS          
Segment Reporting Information [Line Items]          
Total sales 11,526 10,522 27,103 21,672  
Sales:          
(Loss) income from operations 940 1,114 2,388 1,778  
Interest income 274 121 499 259  
Interest expense (59) (87) (120) (175)  
Total assets 50,399 40,513 50,399 40,513  
Capital expenditures 113 43 141 135  
Depreciation and amortization 61 58 122 117  
UNITED STATES | Product | TS          
Segment Reporting Information [Line Items]          
Total sales 7,841 7,043 19,709 14,981  
UNITED STATES | Service | TS          
Segment Reporting Information [Line Items]          
Total sales $ 3,685 $ 3,479 $ 7,394 $ 6,691