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Investments (Tables) | 12 Months Ended
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Dec. 31, 2018
Investments [Abstract] |
Schedule of cost and estimated fair value of investments |
|  | Cost |  |  | Gross unrealized gain |  |  | Gross unrealized loss |  |  | Fair value |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial Paper |  | $ | 667 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 667 |
Treasury Bills |  |  | 7,656 |  |  |  | 41 |  |  |  | 0 |  |  |  | 7,697 |
Equity Securities |  |  | 45 |  |  |  | 0 |  |  |  | 0 |  |  |  | 45 |
|  |  | 8,368 |  |  |  | 41 |  |  |  | 0 |  |  |  | 8,409 |
Less Cash Equivalents |  |  | 667 |  |  |  | 0 |  |  |  | 0 |  |  |  | 667 |
Total Investments, December 31, 2018 |  | $ | 7,701 |  |  | $ | 41 |  |  | $ | 0 |  |  | $ | 7,742 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial Paper |  | $ | 568 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 568 |
Treasury Bills |  |  | 7,687 |  |  |  | 24 |  |  |  | 0 |  |  |  | 7,711 |
Equity Securities |  |  | 54 |  |  |  | 0 |  |  |  | (9 | ) |  |  | 45 |
|  |  | 8,309 |  |  |  | 24 |  |  |  | (9 | ) |  |  | 8,324 |
Less Cash Equivalents |  |  | 568 |  |  |  | 0 |  |  |  | 0 |  |  |  | 568 |
Total Investments, December 31, 2017 |  | $ | 7,741 |  |  | $ | 24 |  |  | $ | (9 | ) |  | $ | 7,756 |
Schedule of Changes in Accumulated Other Comprehensive Income |
|  | December 31, |
|  | 2018 |  |  | 2017 |
Unrealized Gains |  |  |  |  |  |  |  |
Unrealized holding gains arising during the period |  | $ | 19 |  |  | $ | 49 |
Less: Reclassification of gains included in net income (loss) |  |  | 0 |  |  |  | 0 |
|  |  | 19 |  |  |  | 49 |
Deferred Taxes on Unrealized Gains: |  |  |  |  |  |  |  |
Increase in deferred taxes on unrealized gains arising during the period |  |  | 6 |  |  |  | 8 |
Less: Reclassification of taxes on gains included in net income (loss) |  |  | 0 |  |  |  | 0 |
|  |  | 6 |  |  |  | 8 |
Net Change in Accumulated Other Comprehensive Income |  | $ | 13 |  |  | $ | 41 |

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