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Cash Equivalents And Investments (Schedule Of Available-For-Sale Securities) (Details) (USD $)
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Sep. 30, 2014
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Dec. 31, 2013
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|---|---|---|
| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | $ 21,728,171 | $ 15,637,158 |
| Gross Unrealized Gains | 12,134 | 23,517 |
| Gross Unrealized Losses | (40,739) | (5,514) |
| Fair Value | 21,699,566 | 15,655,161 |
| Cash Equivalents | 6,002,989 | 5,991,869 |
| Short-Term Investments | 4,624,757 | 5,742,314 |
| Long-Term Investments | 11,071,820 | 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 | 6,002,989 | 5,751,965 |
| Fair Value | 6,002,989 | 5,751,965 |
| Cash Equivalents | 6,002,989 | 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 | 6,002,989 | 5,751,965 |
| Fair Value | 6,002,989 | 5,751,965 |
| Cash Equivalents | 6,002,989 | 5,751,965 |
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Investments [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 15,725,182 | 9,885,193 |
| Gross Unrealized Gains | 12,134 | 23,517 |
| Gross Unrealized Losses | (40,739) | (5,514) |
| Fair Value | 15,696,577 | 9,903,196 |
| Cash Equivalents | 239,904 | |
| Short-Term Investments | 4,624,757 | 5,742,314 |
| Long-Term Investments | 11,071,820 | 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 | 6,208,172 | 4,024,031 |
| Gross Unrealized Gains | 1,106 | 687 |
| Gross Unrealized Losses | (16,419) | (4,992) |
| Fair Value | 6,192,859 | 4,019,726 |
| Cash Equivalents | 239,904 | |
| Short-Term Investments | 1,923,144 | 2,582,502 |
| Long-Term Investments | 4,269,715 | 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 | 9,517,010 | 5,861,162 |
| Gross Unrealized Gains | 11,028 | 22,830 |
| Gross Unrealized Losses | (24,320) | (522) |
| Fair Value | 9,503,718 | 5,883,470 |
| Short-Term Investments | 2,701,613 | 3,159,812 |
| Long-Term Investments | $ 6,802,105 | $ 2,723,658 |