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Cash and cash equivalents and other investments (Tables)

12 Months Ended

Dec. 31, 2020

Cash and cash equivalents [abstract]

Schedule of Cash and cash equivalents

Cash and cash equivalents are as follows:

	December 31,
	2 0 2 0			2 0 1 9
Cash	$	6,971,175		$	898,394
Cash equivalents (1)		756,523			6,548,053
	$	7,727,698		$	7,446,447

(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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The disclosure of detailed information about Cash and cash equivalents.

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