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Trade receivables - Net (Tables) | 12 Months Ended
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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

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