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Investments (Tables) | 12 Months Ended
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Dec. 31, 2012
Investments [Abstract] |
Cost And Estimated Fair Value Of Investments |
|  |  |  |  | Gross |  | Gross |  | Fair
|  |  |  |  | unrealized |  | unrealized |  | value
|  | Cost |  | gain |  | loss |  |
December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |
Money Market Funds |  | $ | 804,000 |  | $ | 0 |  | $ | 0 |  | $ | 804,000
Commercial Paper |  |  | 200,000 |  |  | 0 |  |  | 0 |  |  | 200,000
Treasury Bills |  |  | 5,249,000 |  |  | 0 |  |  | (1,000) |  |  | 5,248,000
Equity Securities |  |  | 92,000 |  |  | 3,639,000 |  |  | (54,000) |  |  | 3,677,000
|  |  | 6,345,000 |  |  | 3,639,000 |  |  | (55,000) |  |  | 9,929,000
Less Cash Equivalents |  |  | 1,004,000 |  |  | 0 |  |  | 0 |  |  | 1,004,000
Total Investments, December 31, 2012 |  | $ | 5,341,000 |  | $ | 3,639,000 |  | $ | (55,000) |  | $ | 8,925,000
December 31, 2011 |  |  |  |  |  |  |  |
Commercial Paper |  | $ | 5,373,000 |  | $ | 0 |  | $ | 0 |  | $ | 5,373,000
Equity Securities |  |  | 101,000 |  |  | 3,134,000 |  |  | (54,000) |  |  | 3,181,000
|  |  | 5,474,000 |  |  | 3,134,000 |  |  | (54,000) |  |  | 8,554,000
Less Cash Equivalents |  |  | 5,373,000 |  |  | 0 |  |  | 0 |  |  | 5,373,000
Total Investments, December 31, 2011 |  | $ | 101,000 |  | $ | 3,134,000 |  | $ | (54,000) |  | $ | 3,181,000
Schedule Of Realized Gains And Losses On Investments |
| Years Ended December 31,
|  | 2012 |  |  | 2011
Gross Realized Gains |  | $ | 794,000 |  |  | $ | 73,000
Gross Realized Losses |  |  | 0 |  |  |  | 0
Net Realized Gain |  | $ | 794,000 |  |  | $ | 73,000
Schedule Of Changes In Accumulated Other Comprehensive Income |
|  | December 31,
|  | 2012 |  |  | 2011
Unrealized Gains |  |  |  |  |  |  |
Unrealized Holding Gains arising during the Period |  | $ | 1,299,000 |  |  | $ | 425,000
Less: reclassification of gains included in net income |  |  | (794,000) |  |  |  | (73,000)
|  |  | 505,000 |  |  |  | 352,000
Deferred Taxes on Unrealized Gains: |  |  |  |  |  |  |
Increase in Deferred Taxes on Unrealized Gains arising during the Period |  |  | 494,000 |  |  |  | 161,000
Less: Reclassification of taxes on gains included in net income |  |  | (302,000) |  |  |  | (27,000)
|  |  | 192,000 |  |  |  | 134,000
Net Change in Accumulated Other Comprehensive Income |  | $ | 313,000 |  |  | $ | 218,000

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