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v3.23.1

Summary of significant accounting policies (Details Narrative) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 USD ($) shares | Dec. 31, 2022 CNY (¥) shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2021 CNY (¥) shares | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Mar. 03, 2021 shares | Oct. 08, 2019 shares
Research and development costs | $ 0 |  | $ 61,000 |  | $ 497,000 |  |  |
Advertising and promotional expenses | 9,000 |  | 7,000 |  | $ 7,000 |  |  |
Unrecognized contract revenue | $ 6,000,000 |  | $ 5,400,000 |  |  |  |  |
Common stock, issued | shares | 7,899,832 | 7,899,832 | 7,899,832 | 7,899,832 |  |  | 2,061,900 | 1,030,950
ZHEJIANG TIANLAN |  |  |  |  |  |  |  |
Research and development costs | ¥ |  | ¥ 29,115,000 |  | ¥ 23,419,000 |  | ¥ 28,589,000 |  |
Impairment of long-lived assets | $ 0 |  | $ 0 |  |  | ¥ 2,742,000 |  |
Common stock, issued | shares | 82,572,000 | 82,572,000 | 82,572,000 | 82,572,000 |  |  |  |
Revenue |  |  |  |  |  |  |  |
Concentration percentage | 33.00% | 33.00% | 15.00% | 15.00% | 23.00% | 23.00% |  |
Revenue | ZHEJIANG TIANLAN |  |  |  |  |  |  |  |
Concentration percentage | 35.00% | 35.00% | 35.00% | 35.00% | 39.00% | 39.00% |  |
Revenue | ZHEJIANG TIANLAN | Customer One |  |  |  |  |  |  |  |
Concentration percentage | 14.00% | 14.00% | 16.00% | 16.00% | 16.00% | 16.00% |  |
Accounts Receivable |  |  |  |  |  |  |  |
Concentration percentage |  |  | 10.00% | 10.00% |  |  |  |
Accounts Receivable | ZHEJIANG TIANLAN |  |  |  |  |  |  |  |
Concentration percentage | 10.00% | 10.00% | 10.00% | 10.00% |  |  |  |

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