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Cash and cash equivalents and other investments (Tables) | 12 Months Ended
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Dec. 31, 2018
Cash and cash equivalents [abstract] |
Schedule of Cash and cash equivalents |
Cash and cash equivalents are as follows:
| December 31,
| 2 0 1 8 |  | 2 0 1 7
Cash | $ | 514,166 |  | $ | 1,339,887
Cash equivalents (1) |  | 6,473,075 |  |  | 5,863,717
| $ | 6,987,241 |  | $ | 7,203,604
| (1) | Most of these cash equivalents correspond to Treasury Bills issued by the United States Treasury Department, whose initial original maturity is less than 90 days.

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