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Lease obligations (Details 2) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Weighted average remaining lease term : Operating leases 20 years 23 years
Operating lease right-of-use assets $ 219,000 $ 238,000
Current portion of long-term operating lease obligations 113,000 175,000
Long-term operating lease obligations, net of current maturities 87,000 41,000
Total operating lease liabilities $ 200,000 $ 216,000
Weighted average discount rate : operating leases 4.44% 5.00%
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
Weighted average discount rate : Finance leases 0.00% 5.90%