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Short-term debt (Narrative) (Details)
 12 Months Ended
Dec. 11, 2019
USD ($)
Aug. 02, 2019
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
USD ($)
Line of Credit Facility [Line Items]              
Short-term debt     $ 13,296,000       $ 356,000
Debt to EBITDA ratio (greater than)     3.0        
Ratio of net indebtedness to EBITDA     3.77 3.83 3.76 3.83  
CDI | Banco Bradesco S.A.              
Line of Credit Facility [Line Items]              
Debt instrument, basis spread on variable rate (as a percent)     0.67%        
CDI | Banco de la Ciudad de Buenos Aires              
Line of Credit Facility [Line Items]              
Debt instrument, basis spread on variable rate (as a percent)     54.00%        
Short-term bank loans              
Line of Credit Facility [Line Items]              
Short-term debt     $ 10,794,000       0
Short-term bank loans | Banco Bradesco S.A.              
Line of Credit Facility [Line Items]              
Short-term debt     7,454,000        
Short-term bank loans | Banco de la Ciudad de Buenos Aires              
Line of Credit Facility [Line Items]              
Short-term debt     3,340,000        
Revolving Credit Facility              
Line of Credit Facility [Line Items]              
Short-term debt     $ 2,500,000       $ 0
Ratio of net indebtedness to EBITDA     1.66        
Revolving Credit Facility | BOFA              
Line of Credit Facility [Line Items]              
Line of credit facility, maximum borrowing amount   $ 25,000,000          
Revolving Credit Facility | JPMorgan              
Line of Credit Facility [Line Items]              
Line of credit facility, maximum borrowing amount $ 25,000,000            
Revolving Credit Facility | LIBOR | BOFA              
Line of Credit Facility [Line Items]              
Debt instrument, basis spread on variable rate (as a percent)   2.40%          
Revolving Credit Facility | LIBOR | JPMorgan              
Line of Credit Facility [Line Items]              
Debt instrument, basis spread on variable rate (as a percent) 2.25%            
ADBV | Revolving Credit Facility              
Line of Credit Facility [Line Items]              
Ratio of net indebtedness to EBITDA     0.95