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Income Taxes (Schedule Of Deferred Income Tax Assets And Liabilities) (Details) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Current |  |
Assets: |  |
Accruals not currently deductible | $ 3,890,858 | $ 2,605,711
Stock based compensation | 16,636,615 | 13,508,845
Impairment loss on available-for-sale securities | 0 | 0
Other | 3,839,115 | 4,440,407
Total deferred income tax assets | 24,366,588 | 20,554,963
Liabilities: |  |
Excess tax over book depreciation | 0 | 0
Goodwill | 0 | 0
Unrealized gain on investments | 0 | 0
Intangible assets | 0 | 0
Other | (2,114,430) | (1,117,956)
Net deferred income taxes | 22,252,158 | 19,437,007
Non-Current |  |
Assets: |  |
Accruals not currently deductible | 266,802 | 224,803
Stock based compensation | 3,723,490 | 2,508,304
Impairment loss on available-for-sale securities | 73,954 | 135,724
Other | 15,755 | 19,765
Total deferred income tax assets | 4,080,001 | 2,888,596
Liabilities: |  |
Excess tax over book depreciation | (53,538,861) | (46,017,949)
Goodwill | (16,047,068) | (8,868,168)
Unrealized gain on investments | (961,980) | (6,368,670)
Intangible assets | (3,056,712) | (1,205,230)
Other | 0 | 0
Net deferred income taxes | $ (69,524,620) | $ (59,571,421)

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