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Lease obligations (Details 2) ¥ in Thousands, $ in Thousands | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥)
--- | --- | --- | --- | ---
Operating lease right-of-use assets | $ | $ 238 |  | $ 233 |
Current portion of long-term operating lease obligations | $ | 175 |  | 118 |
Long-term operating lease obligations, net of current maturities | $ | 41 |  | 94 |
Total operating lease liabilities | $ | $ 216 |  | $ 212 |
ZHEJIANG TIANLAN |  |  |  |
Property, plant and equipment, at cost |  | ¥ 0 |  | ¥ 0
Accumulated depreciation and impairment losses |  | 0 |  | 0
Property, plant and equipment, net |  | 0 |  | 0
Current maturities of long-term debt |  | 0 |  | 0
Total finance lease liabilities |  | ¥ 0 |  | ¥ 0

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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition Amount of accumulated depreciation and amortization from plant, property, and equipment and right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977 + Details
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