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Contract assets and liabilities (Tables) | 12 Months Ended
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Dec. 31, 2021
Contract assets and liabilities |
|  | 2021 |  |  | 2020 |
|  | US$’000 |  |  | US$’000 |
Unbilled revenue |  |  | 74 |  |  |  | 202 |
|  | 2021 |  |  | 2020 |
|  | US$’000 |  |  | US$’000 |
Deferred revenue |  |  | 1,076 |  |  |  | 1,063 |
|  | December 31, |
|  | 2021 |  |  | 2020 |
|  | US$’000 |  |  | US$’000 |
Contract assets |  |  | 74 |  |  |  | 202 |
Contract liabilities |  |  | (1,076 | ) |  |  | (1,063 | )
Net contract liabilities |  |  | (1,002 | ) |  |  | (861 | )
Net (liability) / asset position for contracts in process |
|  | 2021 |  |  | 2020 |
|  | US$’000 |  |  | US$’000 |
Costs incurred in contracts in process |  |  | 169 |  |  |  | 1,904 |
Estimated earnings |  |  | 59 |  |  |  | - |
Cost and estimated earnings on uncompleted contracts |  |  | 228 |  |  |  | 1,904 |
Less: billings to date |  |  | (1,230 | ) |  |  | (2,765 | )
|  |  | (1,002 | ) |  |  | (861 | )
|  | 2021 |  |  | 2020 |
|  | US$’000 |  |  | US$’000 |
Unbilled revenue |  |  | 74 |  |  |  | 202 |
Deferred revenue |  |  | (1,076 | ) |  |  | (1,063 | )
|  |  | (1,002 | ) |  |  | (861 | )
Disaggregated revenue from contracts |
|  | Year ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
|  | US$’000 |  |  | US$’000 |  |  | US$’000 |
Revenue |  |  |  |  |  |  |  |  |
Trading and manufacturing (revenue recognized at point in time) |  |  | 9,619 |  |  |  | 9,476 |  |  |  | 11,877 |
Engineering (revenue recognized over time) |  |  | 11,769 |  |  |  | 3,881 |  |  |  | 5,522 |
|  |  | 21,388 |  |  |  | 13,357 |  |  |  | 17,399 |
ZHEJIANG TIANLAN |
Contract assets and liabilities |
|  | 2021 |  |  | 2020 |
|  | RMB’000 |  |  | RMB’000 |
Unbilled revenue |  |  | 72,310 |  |  |  | 94,494 |
|  | 2021 |  |  | 2020 |
|  | RMB’000 |  |  | RMB’000 |
Deferred revenue |  |  | 37,481 |  |  |  | 47,135 |
|  | 2021 |  |  | 2020 |
|  | RMB’000 |  |  | RMB’000 |
Contract assets |  |  | 72,310 |  |  |  | 94,494 |
Contract liabilities |  |  | (37,481 | ) |  |  | (47,135 | )
Net contract assets |  |  | 34,829 |  |  |  | 47,359 |
|  | 2021 |  |  | 2020 |
|  | RMB’000 |  |  | RMB’000 |
Gross contract assets |  |  | 81,198 |  |  |  | 102,144 |
Less: allowance for doubtful accounts |  |  | (8,888 | ) |  |  | (7,650 | )
|  |  | 72,310 |  |  |  | 94,494 |
Net (liability) / asset position for contracts in process |
|  | 2021 |  |  | 2020 |
|  | RMB’000 |  |  | RMB’000 |
Estimated earnings on uncompleted contracts |  |  | 503,434 |  |  |  | 406,064 |
Less: billings to date |  |  | (468,605 | ) |  |  | (358,705 | )
|  |  | 34,829 |  |  |  | 47,359 |

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