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Segment Information - Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2022
Segment Reporting Information [Line Items]          
Total sales $ 17,708 $ 13,326 $ 49,321 $ 37,676  
Sales:          
(Loss) income from operations 575 19 2,176 (401)  
Interest income 401 158 987 429  
Interest expense (82) (80) (208) (286)  
Total assets 67,603 64,516 67,603 64,516 $ 75,062
Capital expenditures 34 28 215 223  
Depreciation and amortization 91 79 269 259  
HPP          
Segment Reporting Information [Line Items]          
Total sales 1,335 738 5,300 2,945  
Sales:          
(Loss) income from operations (850) (1,370) (1,641) (3,477)  
Interest income 2 38 10 39  
Interest expense (3) (11) (9) (42)  
Total assets 10,165 8,862 10,165 8,862  
Capital expenditures 27 27 67 87  
Depreciation and amortization 27 28 83 91  
TS          
Segment Reporting Information [Line Items]          
Total sales 16,373 12,588 44,021 34,731  
Sales:          
(Loss) income from operations 1,425 1,389 3,817 3,076  
Interest income 399 120 977 390  
Interest expense (79) (69) (199) (244)  
Total assets 57,438 55,654 57,438 55,654  
Capital expenditures 7 1 148 136  
Depreciation and amortization 64 51 186 168  
Product          
Segment Reporting Information [Line Items]          
Total sales 12,934 8,438 36,143 25,375  
Product | HPP          
Segment Reporting Information [Line Items]          
Total sales 996 427 4,130 2,109  
Product | TS          
Segment Reporting Information [Line Items]          
Total sales 11,938 8,011 32,013 23,266  
Service          
Segment Reporting Information [Line Items]          
Total sales 4,774 4,888 13,178 12,301  
Service | HPP          
Segment Reporting Information [Line Items]          
Total sales 339 311 1,170 836  
Service | TS          
Segment Reporting Information [Line Items]          
Total sales 4,435 4,577 12,008 11,465  
U.K.. | TS          
Segment Reporting Information [Line Items]          
Total sales 206 211 751 682  
Sales:          
(Loss) income from operations (10) (29) (6) (120)  
Interest income 47 12 126 23  
Interest expense 0 0 0    
Total assets 6,914 9,057 6,914 9,057  
Capital expenditures 0 0 0 0  
Depreciation and amortization 0 0 0 0  
U.K.. | Product | TS          
Segment Reporting Information [Line Items]          
Total sales 141 128 507 402  
U.K.. | Service | TS          
Segment Reporting Information [Line Items]          
Total sales 65 83 244 280  
UNITED STATES | TS          
Segment Reporting Information [Line Items]          
Total sales 16,167 12,377 43,270 34,049  
Sales:          
(Loss) income from operations 1,435 1,418 3,823 3,196  
Interest income 352 108 851 367  
Interest expense (79) (69) (199) (244)  
Total assets 50,524 46,597 50,524 46,597  
Capital expenditures 7 1 148 136  
Depreciation and amortization 64 51 186 168  
UNITED STATES | Product | TS          
Segment Reporting Information [Line Items]          
Total sales 11,797 7,883 31,506 22,864  
UNITED STATES | Service | TS          
Segment Reporting Information [Line Items]          
Total sales $ 4,370 $ 4,494 $ 11,764 $ 11,185