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16 Property, plant and equipment (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]        
Cost R$ 602,345 R$ 625,825    
Accumulated amortization (334,094) (311,432)    
Net R$ 268,251 R$ 314,393 R$ 267,612 R$ 255,050
Depreciation average rate 11.20% 12.50%    
Buildings [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Cost R$ 86,860 R$ 82,143    
Accumulated amortization (41,513) (40,438)    
Net R$ 45,347 R$ 41,705 40,125 42,360
Depreciation average rate 2.10% 2.10%    
Land [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Cost R$ 94,213 R$ 92,962    
Net 94,213 92,962 92,979 92,507
Equipment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Cost 372,103 402,850    
Accumulated amortization (271,087) (250,577)    
Net R$ 101,016 R$ 152,273 116,086 103,803
Depreciation average rate 14.80% 16.30%    
Transportation equipment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Cost R$ 10,319 R$ 8,946    
Accumulated amortization (7,350) (6,962)    
Net R$ 2,969 R$ 1,984 3,473 3,680
Depreciation average rate 9.90% 9.90%    
Furniture and fixtures [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Cost R$ 31,232 R$ 31,365    
Accumulated amortization (13,813) (13,146)    
Net R$ 17,419 R$ 18,219 13,578 11,816
Depreciation average rate 6.70% 6.70%    
Other [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Cost R$ 7,618 R$ 7,559    
Accumulated amortization (331) (309)    
Net R$ 7,287 R$ 7,250 R$ 1,371 R$ 884
Depreciation average rate 4.90% 5.00%