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Trade receivables - Net (Tables)
 12 Months Ended
Dec. 31, 2020
Trade and other receivables [abstract]  
Schedule of Age of Receivables Past Due

Age of net receivables that are past due were as follows:

 

  At December 31,
  2 0 2 0   2 0 1 9
           
30 - 60 days $ 164,646   $ 279,048
61 - 90 days   22,288     121,790
91 + days   245,420     535,955
Total $        432,354   $ 936,793
Schedule of Allowance for Doubtful Accounts

During the years ended December 31, 2020 and 2019, the movement in the allowance for doubtful accounts was as follows:

 

 

 2 0 2 0   2 0 1 9
           
Balance at beginning of year $ 237,098   $ 231,778
Provisions   0     4,529
Cancellation   (415)

 

 

   (63)
Account recoveries           (1,333)      
Translations effects   (1,995)     854
Balance at end of year $ 233,355   $ 237,098