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Segment Information - Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Sep. 30, 2023
Segment Reporting Information [Line Items]          
Total sales $ 13,706 $ 13,269 $ 29,081 $ 31,613  
Operating income (loss) 1,234 237 891 1,601  
Interest income 478 325 974 586  
Interest expense 46 62 95 126  
Total assets 64,200 66,024 64,200 66,024 $ 65,904
Capital expenditures (14) (137) (134) (181)  
Depreciation and amortization (75) (88) (154) (177)  
HPP          
Segment Reporting Information [Line Items]          
Total sales 2,502 1,476 3,214 3,965  
Operating income (loss) 266 (693) (1,079) (791)  
Interest income 6 7 12 8  
Interest expense 3 3 7 6  
Total assets 11,599 8,695 11,599 8,695  
Capital expenditures (12) (24) (118) (40)  
Depreciation and amortization (25) (27) (53) (56)  
TS          
Segment Reporting Information [Line Items]          
Total sales 11,204 11,793 25,867 27,648  
Operating income (loss) 968 930 1,970 2,392  
Interest income 472 318 962 578  
Interest expense 43 59 88 120  
Total assets 52,601 57,329 52,601 57,329  
Capital expenditures (2) (113) (16) (141)  
Depreciation and amortization (50) (61) (101) (121)  
Product          
Segment Reporting Information [Line Items]          
Total sales 8,458 8,988 19,865 23,209  
Product | HPP          
Segment Reporting Information [Line Items]          
Total sales 2,043 972 2,515 3,134  
Product | TS          
Segment Reporting Information [Line Items]          
Total sales 6,415 8,016 17,350 20,075  
Service          
Segment Reporting Information [Line Items]          
Total sales 5,248 4,281 9,216 8,404  
Service | HPP          
Segment Reporting Information [Line Items]          
Total sales 459 504 699 831  
Service | TS          
Segment Reporting Information [Line Items]          
Total sales 4,789 3,777 8,517 7,573  
U.K.. | TS          
Segment Reporting Information [Line Items]          
Total sales 121 267 502 545  
Operating income (loss) (56) (10) (53) 4  
Interest income 54 44 108 79  
Interest expense 0 0 0    
Total assets 7,581 6,930 7,581 6,930  
Capital expenditures 0 0 0 0  
Depreciation and amortization 0 0 0 0  
U.K.. | Product | TS          
Segment Reporting Information [Line Items]          
Total sales 61 175 373 366  
U.K.. | Service | TS          
Segment Reporting Information [Line Items]          
Total sales 60 92 129 179  
UNITED STATES | TS          
Segment Reporting Information [Line Items]          
Total sales 11,083 11,526 25,365 27,103  
Operating income (loss) 1,024 940 2,023 2,388  
Interest income 418 274 854 499  
Interest expense 43 59 88 120  
Total assets 45,020 50,399 45,020 50,399  
Capital expenditures (2) (113) (16) (141)  
Depreciation and amortization (50) (61) (101) (121)  
UNITED STATES | Product | TS          
Segment Reporting Information [Line Items]          
Total sales 6,354 7,841 16,977 19,709  
UNITED STATES | Service | TS          
Segment Reporting Information [Line Items]          
Total sales $ 4,729 $ 3,685 $ 8,388 $ 7,394