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2 Significant accounting policies (Details 1)
12 Months Ended
Dec. 31, 2020
Building [member]  
SignificantAccountingPoliciesLineItems [Line Items]  
Useful lives of assets 25 years
Machinery and equipment [member]  
SignificantAccountingPoliciesLineItems [Line Items]  
Useful lives of assets 10 years
Vehicles [member]  
SignificantAccountingPoliciesLineItems [Line Items]  
Useful lives of assets 4 years
Furniture and fixtures [member]  
SignificantAccountingPoliciesLineItems [Line Items]  
Useful lives of assets 10 years
IT equipment [member]  
SignificantAccountingPoliciesLineItems [Line Items]  
Useful lives of assets 5 years
Library books [member]  
SignificantAccountingPoliciesLineItems [Line Items]  
Useful lives of assets 10 years
Laboratories and clinics [member]  
SignificantAccountingPoliciesLineItems [Line Items]  
Useful lives of assets 10 years
Leasehold improvements [member]  
SignificantAccountingPoliciesLineItems [Line Items]  
Useful lives of assets 20 years