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SEGMENT AND GEOGRAPHIC AREA INFORMATION - Segment Reporting Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenue | $ 26,236 |  |  | $ 30,272 |  |  | $ 81,003 | $ 94,087 |
Cost of revenue | 15,244 |  |  | 16,260 |  |  | 46,982 | 53,202 |
Other divisional costs | 9,164 |  |  | 10,205 |  |  | 28,990 | 29,583 |
Division operating income (loss) | 1,828 |  |  | 3,807 |  |  | 5,031 | 11,302 |
Amortization of acquired intangible assets | 841 |  |  | 944 |  |  | 2,504 | 2,436 |
Restructuring costs | 116 |  |  | 0 |  |  | 645 | 0 |
Corporate expenses | 2,064 |  |  | 2,376 |  |  | 6,883 | 7,551 |
Operating (loss) income | (1,193) |  |  | 487 |  |  | (5,001) | 1,315 |
Interest expense | (95) |  |  | (219) |  |  | (366) | (612) |
Other income | 61 |  |  | 301 |  |  | 768 | 949 |
(Loss) earnings before income tax (benefit) expense | (1,227) |  |  | 569 |  |  | (4,599) | 1,652 |
Depreciation | 317 |  |  | 355 |  |  | 947 | 984 |
Amortization of stock-based deferred compensation | 354 | $ 435 | $ 423 | 537 | $ 564 | $ 349 | 1,212 | 1,450 |
Capital expenditures | 407 |  |  | 505 |  |  | 1,098 | 1,161 |
Total assets | 148,277 |  |  | 158,367 |  |  | 148,277 | 158,367 | $ 152,288
Corporate & Other |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Amortization of acquired intangible assets | 841 |  |  | 944 |  |  | 2,504 | 2,436 |
Restructuring costs | 116 |  |  |  |  |  | 645 |  |
Corporate expenses | 2,064 |  |  | 2,376 |  |  | 6,883 | 7,551 |
Operating (loss) income | (3,021) |  |  | (3,320) |  |  | (10,032) | (9,987) |
Interest expense | (95) |  |  | (219) |  |  | (366) | (612) |
Other income | 61 |  |  | 301 |  |  | 768 | 949 |
(Loss) earnings before income tax (benefit) expense | (3,055) |  |  | (3,238) |  |  | (9,630) | (9,650) |
Depreciation | 44 |  |  | 22 |  |  | 118 | 65 |
Amortization of stock-based deferred compensation | 215 |  |  | 380 |  |  | 764 | 1,067 |
Capital expenditures | 123 |  |  | 168 |  |  | 496 | 244 |
Total assets | 1,859 |  |  | 1,844 |  |  | 1,859 | 1,844 |
Electronic Test | Operating Segments |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenue | 12,099 |  |  | 15,481 |  |  | 39,091 | 42,756 |
Cost of revenue | 6,498 |  |  | 7,861 |  |  | 21,229 | 22,869 |
Other divisional costs | 4,455 |  |  | 5,309 |  |  | 14,475 | 14,020 |
Division operating income (loss) | 1,146 |  |  | 2,311 |  |  | 3,387 | 5,867 |
Operating (loss) income | 1,146 |  |  | 2,311 |  |  | 3,387 | 5,867 |
(Loss) earnings before income tax (benefit) expense | 1,146 |  |  | 2,311 |  |  | 3,387 | 5,867 |
Depreciation | 157 |  |  | 157 |  |  | 463 | 399 |
Amortization of stock-based deferred compensation | 99 |  |  | 56 |  |  | 239 | 162 |
Capital expenditures | 198 |  |  | 130 |  |  | 395 | 272 |
Total assets | 75,397 |  |  | 81,592 |  |  | 75,397 | 81,592 |
Environmental Technologies | Operating Segments |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenue | 7,490 |  |  | 6,734 |  |  | 20,973 | 21,835 |
Cost of revenue | 4,566 |  |  | 4,035 |  |  | 13,263 | 13,584 |
Other divisional costs | 2,144 |  |  | 2,273 |  |  | 6,574 | 6,817 |
Division operating income (loss) | 780 |  |  | 426 |  |  | 1,136 | 1,434 |
Operating (loss) income | 780 |  |  | 426 |  |  | 1,136 | 1,434 |
(Loss) earnings before income tax (benefit) expense | 780 |  |  | 426 |  |  | 1,136 | 1,434 |
Depreciation | 57 |  |  | 83 |  |  | 184 | 227 |
Amortization of stock-based deferred compensation | 41 |  |  | 48 |  |  | 90 | 134 |
Capital expenditures | 62 |  |  | 161 |  |  | 168 | 512 |
Total assets | 21,710 |  |  | 21,335 |  |  | 21,710 | 21,335 |
Process Technologies | Operating Segments |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenue | 6,647 |  |  | 8,057 |  |  | 20,939 | 29,496 |
Cost of revenue | 4,180 |  |  | 4,364 |  |  | 12,490 | 16,749 |
Other divisional costs | 2,565 |  |  | 2,623 |  |  | 7,941 | 8,746 |
Division operating income (loss) | (98) |  |  | 1,070 |  |  | 508 | 4,001 |
Operating (loss) income | (98) |  |  | 1,070 |  |  | 508 | 4,001 |
(Loss) earnings before income tax (benefit) expense | (98) |  |  | 1,070 |  |  | 508 | 4,001 |
Depreciation | 59 |  |  | 93 |  |  | 182 | 293 |
Amortization of stock-based deferred compensation | (1) |  |  | 53 |  |  | 119 | 87 |
Capital expenditures | 24 |  |  | 46 |  |  | 39 | 133 |
Total assets | $ 49,311 |  |  | $ 53,596 |  |  | $ 49,311 | $ 53,596 |

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