XML 24 R109.htm IDEA: XBRL DOCUMENT v3.20.1
Summary of the main accounting policies: Land, furniture and equipment (Details)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Furniture & equipment | Minimum    
Land, furniture and equipment:    
Useful life measured as period of time, property, plant and equipment 10 years 10 years
Furniture & equipment | Maximum    
Land, furniture and equipment:    
Useful life measured as period of time, property, plant and equipment 20 years 20 years
Machinery & equipment | Minimum    
Land, furniture and equipment:    
Useful life measured as period of time, property, plant and equipment 10 years 10 years
Machinery & equipment | Maximum    
Land, furniture and equipment:    
Useful life measured as period of time, property, plant and equipment 20 years 20 years
Computer equipment | Minimum    
Land, furniture and equipment:    
Useful life measured as period of time, property, plant and equipment 20 years 20 years
Computer equipment | Maximum    
Land, furniture and equipment:    
Useful life measured as period of time, property, plant and equipment 33 years 33 years
Commercial vehicles | Minimum    
Land, furniture and equipment:    
Useful life measured as period of time, property, plant and equipment 20 years 20 years
Commercial vehicles | Maximum    
Land, furniture and equipment:    
Useful life measured as period of time, property, plant and equipment 25 years 25 years
Improvements to leased premises    
Land, furniture and equipment:    
Useful life measured as period of time, property, plant and equipment   10 years