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4 Segment information (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]      
External costumer R$ 1,201,191 R$ 750,630  
Inter-segment  
Net revenue 1,201,191 750,630 R$ 333,935
Cost of services (434,654) (308,853) (168,052)
Gross profit 766,537 441,777 165,883
General and administrative expenses (402,855) (239,120) (70,034)
Other expenses, net (347) 2,594  
Operating profit 363,335 205,251 96,448
Finance income 62,290 51,689 10,428
Finance expenses (98,269) (72,365)  
Share of income of associate 7,698 2,362  
Income before income taxes 335,054 186,937 98,722
Income taxes expense (27,067) (14,175) (3,988)
Net income 307,987 172,762 R$ 94,734
Operating segments [member] | Business unit one [member]      
Disclosure of operating segments [line items]      
External costumer 1,002,461 653,760  
Inter-segment  
Net revenue 1,002,461 653,760  
Cost of services (381,964) (279,066)  
Gross profit 620,497 374,694  
General and administrative expenses    
Other expenses, net    
Operating profit    
Finance income    
Finance expenses    
Share of income of associate    
Income before income taxes    
Income taxes expense    
Net income    
Operating segments [member] | Business unit two [member]      
Disclosure of operating segments [line items]      
External costumer 198,730 96,870  
Inter-segment 1,619 3,880  
Net revenue 200,349 100,750  
Cost of services (54,309) (33,667)  
Gross profit 146,040 67,083  
General and administrative expenses    
Other expenses, net    
Operating profit    
Finance income    
Finance expenses    
Share of income of associate    
Income before income taxes    
Income taxes expense    
Net income    
Operating segments [member] | Total reportable segments [member]      
Disclosure of operating segments [line items]      
External costumer 1,201,191 750,630  
Inter-segment 1,619 3,880  
Net revenue 1,202,810 754,510  
Cost of services (436,273) (312,733)  
Gross profit 766,537 441,777  
General and administrative expenses    
Other expenses, net    
Operating profit    
Finance income    
Finance expenses    
Share of income of associate    
Income before income taxes    
Income taxes expense    
Net income    
Adjustments and eliminations [member]      
Disclosure of operating segments [line items]      
External costumer [1]  
Inter-segment (1,619) (3,880) [1]  
Net revenue (1,619) (3,880) [1]  
Cost of services 1,619 3,880 [1]  
Gross profit [1]  
General and administrative expenses    
Other expenses, net    
Operating profit    
Finance income    
Finance expenses    
Share of income of associate    
Income before income taxes    
Income taxes expense    
Net income    
[1] These eliminations are related to sale transactions from Medcel to other entities in Business Unit 1.