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Investments (Tables) | 12 Months Ended
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Dec. 31, 2020
Investments [Abstract] |
Schedule of cost and estimated fair value of investments |
|  | Cost |  |  | Gross unrealized gain |  |  | Gross unrealized loss |  |  | Fair value |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial Paper |  | $ | 718 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 718 |
Treasury Bills |  |  | 7,998 |  |  |  | 1 |  |  |  | 0 |  |  |  | 7,999 |
Equity Securities |  |  | 54 |  |  |  | 0 |  |  |  | (12 | ) |  |  | 42 |
|  |  | 8,770 |  |  |  | 1 |  |  |  | (12 | ) |  |  | 8,759 |
Less Cash Equivalents |  |  | 718 |  |  |  | 0 |  |  |  | 0 |  |  |  | 718 |
Total Investments, December 31, 2020 |  | $ | 8,052 |  |  | $ | 1 |  |  | $ | (12 | ) |  | $ | 8,041 |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial Paper |  | $ | 797 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 797 |
Treasury Bills |  |  | 7,734 |  |  |  | 0 |  |  |  | 0 |  |  |  | 7,734 |
Equity Securities |  |  | 54 |  |  |  | 0 |  |  |  | (9 | ) |  |  | 45 |
|  |  | 8,585 |  |  |  | 0 |  |  |  | (9 | ) |  |  | 8,576 |
Less Cash Equivalents |  |  | 8,531 |  |  |  | 0 |  |  |  | 0 |  |  |  | 8,531 |
Total Investments, December 31, 2019 |  | $ | 54 |  |  | $ | 0 |  |  | $ | (9 | ) |  | $ | 45 |
Schedule of Changes in Accumulated Other Comprehensive Income |
|  | December 31, |
|  | 2020 |  |  | 2019 |
Unrealized Gains |  |  |  |  |  |  |  |
Unrealized holding gains arising during the period |  | $ | 1 |  |  | $ | 0 |
Less: Reclassification of gains included in net income (loss) |  |  | 0 |  |  |  | (41 | )
|  |  | 1 |  |  |  | (41 | )
Deferred Taxes on Unrealized Gains: |  |  |  |  |  |  |  |
Increase in deferred taxes on unrealized gains arising during the period |  |  | 0 |  |  |  | 0 |
Less: Reclassification of taxes on gains included in net income (loss) |  |  | 0 |  |  |  | (9 | )
|  |  | 0 |  |  |  | (9 | )
Net Change in Accumulated Other Comprehensive Income (Loss) |  | $ | 1 |  |  | $ | (32 | )

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