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Segment Information - Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Sep. 30, 2024
Segment Reporting Information [Line Items]          
Segment Reporting, CODM     srt:ChiefExecutiveOfficerMember    
Segment Reporting, CODM, Profit (Loss) Measure, How Used     allocates resources and assesses performance against the Company’s strategies and budgets. It is also consistent with how we manage the business and view the markets we serve.    
Total sales $ 13,147 $ 13,706 $ 28,817 $ 29,081  
Operating (loss) income (994) 1,234 (1,348) 891  
Interest expense (77) (46) (154) (95)  
Interest income 414 478 903 974  
Total assets 67,122 64,200 67,122 64,200 $ 69,436
Capital expenditures (7) (14) (54) (134)  
Depreciation and amortization (59) (75) (122) (154)  
High Performance Products Segment          
Segment Reporting Information [Line Items]          
Total sales 647 2,502 1,077 3,214  
Operating (loss) income (1,566) 266 (3,239) (1,079)  
Interest expense (3) (3) (5) (7)  
Interest income 1 6 2 12  
Total assets 11,544 11,599 11,544 11,599  
Capital expenditures (2) (12) (3) (118)  
Depreciation and amortization (18) (25) (38) (53)  
Technology Solutions Segment          
Segment Reporting Information [Line Items]          
Total sales 12,500 11,204 27,740 25,867  
Operating (loss) income 572 968 1,891 1,970  
Interest expense (74) (43) (149) (88)  
Interest income 413 472 901 962  
Total assets 55,578 52,601 55,578 52,601  
Capital expenditures (5) (2) (51) (16)  
Depreciation and amortization (41) (50) (84) (101)  
Product          
Segment Reporting Information [Line Items]          
Total sales 8,552 8,458 19,567 19,865  
Product | High Performance Products Segment          
Segment Reporting Information [Line Items]          
Total sales 273 2,043 355 2,515  
Product | Technology Solutions Segment          
Segment Reporting Information [Line Items]          
Total sales 8,279 6,415 19,212 17,350  
Service          
Segment Reporting Information [Line Items]          
Total sales 4,595 5,248 9,250 9,216  
Service | High Performance Products Segment          
Segment Reporting Information [Line Items]          
Total sales 374 459 722 699  
Service | Technology Solutions Segment          
Segment Reporting Information [Line Items]          
Total sales 4,221 4,789 8,528 8,517  
U.S. | Technology Solutions Segment          
Segment Reporting Information [Line Items]          
Total sales 12,021 11,083 27,081 25,365  
Operating (loss) income 592 1,024 2,006 2,023  
Interest expense (74) (43) (149) (88)  
Interest income 370 418 809 854  
Total assets 47,517 45,020 47,517 45,020  
Capital expenditures (5) (2) (51) (16)  
Depreciation and amortization (41) (50) (84) (101)  
U.S. | Product | Technology Solutions Segment          
Segment Reporting Information [Line Items]          
Total sales 7,862 6,354 18,662 16,977  
U.S. | Service | Technology Solutions Segment          
Segment Reporting Information [Line Items]          
Total sales 4,159 4,729 8,419 8,388  
United Kingdom | Technology Solutions Segment          
Segment Reporting Information [Line Items]          
Total sales 479 121 659 502  
Operating (loss) income (20) (56) (115) (53)  
Interest expense 0 0 0 0  
Interest income 43 54 92 108  
Total assets 8,061 7,581 8,061 7,581  
Capital expenditures 0 0 0 0  
Depreciation and amortization 0 0 0 0  
United Kingdom | Product | Technology Solutions Segment          
Segment Reporting Information [Line Items]          
Total sales 417 61 550 373  
United Kingdom | Service | Technology Solutions Segment          
Segment Reporting Information [Line Items]          
Total sales $ 62 $ 60 $ 109 $ 129