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Cash and cash equivalents and other investments (Tables) | 12 Months Ended
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Dec. 31, 2019
Cash and cash equivalents [abstract] |
Schedule of Cash and cash equivalents | Cash and cash equivalents are as follows:
| December 31,
| 2 0 1 9 |  | 2 0 1 8
Cash | $ | 898,394 |  | $ | 514,166
Cash equivalents (1) |  | 6,548,053 |  |  | 6,473,075
| $ | 7,446,447 |  | $ | 6,987,241
| (1) | Cash equivalents are investments with initial original maturities of less than 90 days and consist primarily of Treasury Bills issued by the United States Treasury Department.

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- Definition The disclosure of detailed information about Cash and cash equivalents. + References No definition available. + Details
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