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Investments (Tables) | 12 Months Ended
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Dec. 31, 2015
Investments [Abstract] |
Cost And Estimated Fair Value Of Investments |
|  |  |  |  | Gross |  | Gross |  | Fair
|  |  |  |  | unrealized |  | unrealized |  | value
|  | Cost |  | gain |  | loss |  |
December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Money Market Funds |  | $ | 246 |  | $ | 0 |  | $ | 0 |  | $ | 246
Commercial Paper |  |  | 247 |  |  | 0 |  |  | 0 |  |  | 247
Treasury Bills |  |  | 7,876 |  |  | 0 |  |  | (4) |  |  | 7,872
Equity Securities |  |  | 54 |  |  | 0 |  |  | (54) |  |  | 0
|  |  | 8,423 |  |  | 0 |  |  | (58) |  |  | 8,365
Less Cash Equivalents |  |  | 493 |  |  | 0 |  |  | 0 |  |  | 493
Total Investments, December 31, 2015 |  | $ | 7,930 |  | $ | 0 |  | $ | (58) |  | $ | 7,872
December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |
Money Market Funds |  | $ | 510 |  | $ | 0 |  | $ | 0 |  | $ | 510
Commercial Paper |  |  | 345 |  |  | 0 |  |  | 0 |  |  | 345
Treasury Bills |  |  | 6,542 |  |  | 0 |  |  | 0 |  |  | 6,542
Equity Securities |  |  | 72 |  |  | 1,238 |  |  | (54) |  |  | 1,256
|  |  | 7,469 |  |  | 1,238 |  |  | (54) |  |  | 8,653
Less Cash Equivalents |  |  | 855 |  |  | 0 |  |  | 0 |  |  | 855
Total Investments, December 31, 2014 |  | $ | 6,614 |  | $ | 1,238 |  | $ | (54) |  | $ | 7,798
Schedule Of Realized Gains And Losses On Investments |
|  | Years Ended December 31,
|  | 2015 |  |  | 2014
Gross Realized Gains |  | $ | 1,449 |  |  | $ | 1,163
Gross Realized Losses |  |  | 0 |  |  |  | 0
Net Realized Gain |  | $ | 1,449 |  |  | $ | 1,163
Schedule Of Changes In Accumulated Other Comprehensive Income |
|  | December 31,
|  | 2015 |  |  | 2014
Unrealized Gains (Losses) |  |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period |  | $ | 211 |  |  | $ | (284)
Less: Reclassification of gains included in net income |  |  | (1,449) |  |  |  | (1,163)
|  |  | (1,238) |  |  |  | (1,447)
Deferred Taxes on Unrealized Gains (Losses): |  |  |  |  |  |  |
Increase (decrease) in deferred taxes on unrealized gains (losses) arising during the period |  |  | 80 |  |  |  | (108)
Less: Reclassification of taxes on gains included in net income |  |  | (551) |  |  |  | (442)
|  |  | (471) |  |  |  | (550)
Net Change in Accumulated Other Comprehensive Income (Loss) |  | $ | (767) |  |  | $ | (897)

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