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Income Taxes (Schedule Of Deferred Income Tax Assets And Liabilities) (Details) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Current |  |
Assets: |  |
Accruals not currently deductible | $ 2,970,671 | $ 3,721,183
Stock based compensation | 13,290,429 | 12,044,953
Impairment loss on available-for-sale securities | 0 | 0
Intangible Assets | 0 | 0
Other | 4,713,241 | 5,690,130
Total deferred income tax assets | 20,974,341 | 21,456,266
Liabilities: |  |
Excess tax over book depreciation | 0 | 0
Patent costs | 0 | 0
Unrealized gain on investments | 0 | 0
Other | (558,249) | (527,417)
Net deferred income taxes | 20,416,092 | 20,928,849
Non-Current |  |
Assets: |  |
Accruals not currently deductible | 182,803 | 186,997
Stock based compensation | 2,202,940 | 1,696,966
Impairment loss on available-for-sale securities | 175,091 | 327,308
Intangible Assets | 169,913 | 0
Other | 40,203 | 3,609
Total deferred income tax assets | 2,770,950 | 2,214,880
Liabilities: |  |
Excess tax over book depreciation | (41,374,851) | (47,704,521)
Patent costs | (1,792,968) | (8,137,111)
Unrealized gain on investments | (10,482,468) | (3,146,585)
Other |  | 0
Net deferred income taxes | $ (50,879,337) | $ (56,773,337)

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