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Cash Equivalents And Investments (Schedule Of Available-For-Sale Securities) (Details) (USD $)
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Mar. 31, 2014
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Dec. 31, 2013
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|---|---|---|
| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | $ 21,663,093 | $ 15,637,158 |
| Gross Unrealized Gains | 20,768 | 23,517 |
| Gross Unrealized Losses | (25,655) | (5,514) |
| Fair Value | 21,658,206 | 15,655,161 |
| Cash Equivalents | 6,858,015 | 5,991,869 |
| Short-Term Investments | 5,322,407 | 5,742,314 |
| Long-Term Investments | 9,477,784 | 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 | 6,618,007 | 5,751,965 |
| Fair Value | 6,618,007 | 5,751,965 |
| Cash Equivalents | 6,618,007 | 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 | 6,618,007 | 5,751,965 |
| Fair Value | 6,618,007 | 5,751,965 |
| Cash Equivalents | 6,618,007 | 5,751,965 |
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Investments [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 15,045,086 | 9,885,193 |
| Gross Unrealized Gains | 20,768 | 23,517 |
| Gross Unrealized Losses | (25,655) | (5,514) |
| Fair Value | 15,040,199 | 9,903,196 |
| Cash Equivalents | 240,008 | 239,904 |
| Short-Term Investments | 5,322,407 | 5,742,314 |
| Long-Term Investments | 9,477,784 | 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 | 4,564,372 | 4,024,031 |
| Gross Unrealized Gains | 1,248 | 687 |
| Gross Unrealized Losses | (5,960) | (4,992) |
| Fair Value | 4,559,660 | 4,019,726 |
| Cash Equivalents | 240,008 | 239,904 |
| Short-Term Investments | 1,920,119 | 2,582,502 |
| Long-Term Investments | 2,399,533 | 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 | 10,480,714 | 5,861,162 |
| Gross Unrealized Gains | 19,520 | 22,830 |
| Gross Unrealized Losses | (19,695) | (522) |
| Fair Value | 10,480,539 | 5,883,470 |
| Short-Term Investments | 3,402,288 | 3,159,812 |
| Long-Term Investments | $ 7,078,251 | $ 2,723,658 |