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Investments (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments [Abstract] |
Schedule of cost and estimated fair value of investments |
|  | Cost |  |  | Gross unrealized gain |  |  | Gross unrealized loss |  |  | Fair value |
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 |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial Paper |  | $ | 348 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 348 |
Treasury Bills |  |  | 7,419 |  |  |  | 8 |  |  |  | 0 |  |  |  | 7,427 |
Equity Securities |  |  | 54 |  |  |  | 0 |  |  |  | (54 | ) |  |  | 0 |
|  |  | 7,821 |  |  |  | 8 |  |  |  | (54 | ) |  |  | 7,775 |
Less Cash Equivalents |  |  | 348 |  |  |  | 0 |  |  |  | 0 |  |  |  | 348 |
Total Investments, December 31, 2016 |  | $ | 7,473 |  |  | $ | 8 |  |  | $ | (54 | ) |  | $ | 7,427 |
Schedule of realized gains and losses on investments |
|  | Years Ended December 31, |
|  | 2017 |  |  | 2016 |
Gross Realized Gains |  | $ | 0 |  |  | $ | 0 |
Gross Realized Losses |  |  | 0 |  |  |  | 0 |
Net Realized Gain |  | $ | 0 |  |  | $ | 0 |
Schedule Of Changes In Accumulated Other Comprehensive Income (Losses) |
|  | December 31, |
|  | 2017 |  |  | 2016 |
Unrealized Gains (Losses) |  |  |  |  |  |  |  |
Unrealized holding gains arising during the period |  | $ | 49 |  |  | $ | 8 |
Less: Reclassification of gains included in net income |  |  | 0 |  |  |  | 0 |
|  |  | 49 |  |  |  | 8 |
Deferred Taxes on Unrealized Gains (Losses): |  |  |  |  |  |  |  |
Increase in deferred taxes on unrealized gains arising during the period |  |  | 8 |  |  |  | 4 |
Less: Reclassification of taxes on gains included in net income |  |  | 0 |  |  |  | 0 |
|  |  | 8 |  |  |  | 4 |
Net Change in Accumulated Other Comprehensive Income (Loss) |  | $ | 41 |  |  | $ | 4 |

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