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Segment Information - Operating Segments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2020
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Information [Line Items]              
Sales $ 13,780 $ 16,883 $ 16,858 $ 33,741 $ 47,521 $ 61,793 $ 79,061
Sales:              
Income (loss) from operations (393) (143) (402) (545) (938) (1,424) (826)
Total assets           53,645 59,369
Capital expenditures           230 832
Depreciation and amortization           452 416
High Performance Products Segment              
Segment Reporting Information [Line Items]              
Sales           5,876 7,902
Sales:              
Income (loss) from operations           (3,730) (3,085)
Total assets           9,915 11,548
Capital expenditures           89 310
Depreciation and amortization           218 230
TS              
Segment Reporting Information [Line Items]              
Sales           55,917 71,159
Sales:              
Income (loss) from operations           2,306 2,259
Total assets           43,730 47,821
Capital expenditures           141 522
Depreciation and amortization           234 186
Product              
Segment Reporting Information [Line Items]              
Sales 10,399 13,146 13,559 26,705 37,104 47,989 66,017
Product | High Performance Products Segment              
Segment Reporting Information [Line Items]              
Sales           3,401 6,406
Product | TS              
Segment Reporting Information [Line Items]              
Sales           44,588 59,611
Service              
Segment Reporting Information [Line Items]              
Sales $ 3,381 $ 3,737 $ 3,299 $ 7,036 $ 10,417 13,804 13,044
Service | High Performance Products Segment              
Segment Reporting Information [Line Items]              
Sales           2,475 1,496
Service | TS              
Segment Reporting Information [Line Items]              
Sales           11,329 11,548
U.K. | TS              
Segment Reporting Information [Line Items]              
Sales           1,383 5,316
Sales:              
Income (loss) from operations           (168) (62)
Total assets           10,296 10,530
Capital expenditures             6
Depreciation and amortization           3 6
U.K. | Product | TS              
Segment Reporting Information [Line Items]              
Sales           943 4,936
U.K. | Service | TS              
Segment Reporting Information [Line Items]              
Sales           440 380
U.S. | TS              
Segment Reporting Information [Line Items]              
Sales           54,534 65,843
Sales:              
Income (loss) from operations           2,474 2,321
Total assets           33,434 37,291
Capital expenditures           141 516
Depreciation and amortization           231 180
U.S. | Product | TS              
Segment Reporting Information [Line Items]              
Sales           43,645 54,675
U.S. | Service | TS              
Segment Reporting Information [Line Items]              
Sales           $ 10,889 $ 11,168
North America              
Sales:              
Percentage of long lived assets           99.00%