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Lease obligations (Details 3) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Weighted-average remaining lease term - operating leases | 23 months | 16 months
Weighted-average discount rate - operating leases | 5.00% | 5.00%
ZHEJIANG TIANLAN |  |
Weighted-average remaining lease term - finance leases | 0 months | 0 months
Weighted-average discount rate - finance leases | 5.90% | 5.90%

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