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Cash Equivalents And Investments (Schedule Of Available-For-Sale Securities) (Details) (USD $)
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Jun. 30, 2014
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Dec. 31, 2013
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|---|---|---|
| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | $ 21,695,577 | $ 15,637,158 |
| Gross Unrealized Gains | 22,135 | 23,517 |
| Gross Unrealized Losses | (18,742) | (5,514) |
| Fair Value | 21,698,970 | 15,655,161 |
| Cash Equivalents | 5,198,202 | 5,991,869 |
| Short-Term Investments | 5,876,551 | 5,742,314 |
| Long-Term Investments | 10,624,217 | 3,920,978 |
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Cash And Cash Equivalents [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 5,198,202 | 5,751,965 |
| Fair Value | 5,198,202 | 5,751,965 |
| Cash Equivalents | 5,198,202 | 5,751,965 |
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Cash And Cash Equivalents [Member] | Money Market Funds [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 5,198,202 | 5,751,965 |
| Fair Value | 5,198,202 | 5,751,965 |
| Cash Equivalents | 5,198,202 | 5,751,965 |
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Investments [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 16,497,375 | 9,885,193 |
| Gross Unrealized Gains | 22,135 | 23,517 |
| Gross Unrealized Losses | (18,742) | (5,514) |
| Fair Value | 16,500,768 | 9,903,196 |
| Cash Equivalents | 239,904 | |
| Short-Term Investments | 5,876,551 | 5,742,314 |
| Long-Term Investments | 10,624,217 | 3,920,978 |
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Investments [Member] | Certificates Of Deposit [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 5,969,139 | 4,024,031 |
| Gross Unrealized Gains | 1,315 | 687 |
| Gross Unrealized Losses | (7,355) | (4,992) |
| Fair Value | 5,963,099 | 4,019,726 |
| Cash Equivalents | 239,904 | |
| Short-Term Investments | 2,881,947 | 2,582,502 |
| Long-Term Investments | 3,081,152 | 1,197,320 |
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Investments [Member] | Corporate Notes And Bonds [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 10,528,236 | 5,861,162 |
| Gross Unrealized Gains | 20,820 | 22,830 |
| Gross Unrealized Losses | (11,387) | (522) |
| Fair Value | 10,537,669 | 5,883,470 |
| Short-Term Investments | 2,994,604 | 3,159,812 |
| Long-Term Investments | $ 7,543,065 | $ 2,723,658 |