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v3.22.4

Segment information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Revenue | $ 21,388,000 | $ 13,357,000 | $ 17,399,000
Operating loss | 781,000 | (1,701,000) | (440,000)
Depreciation | 38,000 | 49,000 | 69,000
Capital expenditures, gross | 4,000 | 11,000 | 21,000
Assets | 21,250,000 | 20,095,000 |
Liabilities | 6,449,000 | 5,632,000 |
Trading and Manufacturing |  |  |
Revenue | 9,619,000 | 9,476,000 | 11,877,000
Operating loss | 140,000 | (488,000) | (102,000)
Depreciation | 32,000 | 39,000 | 54,000
Capital expenditures, gross | 1,000 | 2,000 | 17,000
Assets | 7,969,000 | 7,877,000 |
Liabilities | 3,428,000 | 2,645,000 |
Engineering |  |  |
Revenue | 11,769,000 | 3,881,000 | 5,522,000
Operating loss | 846,000 | (1,027,000) | (158,000)
Depreciation | 6,000 | 10,000 | 15,000
Capital expenditures, gross | 3,000 | 9,000 | 4,000
Assets | 13,281,000 | 12,218,000 |
Liabilities | 3,021,000 | 2,987,000 |
Unallocated Corporate Expenses |  |  |
Revenue |  | 0 |
Operating loss | $ (205,000) | $ (186,000) | $ (180,000)

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