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Cash Equivalents And Investments (Schedule Of Available-For-Sale Securities) (Details) (USD $)
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Dec. 31, 2013
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Dec. 31, 2012
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|---|---|---|
| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | $ 15,637,158 | $ 23,535,756 |
| Gross Unrealized Gains | 23,517 | 42,826 |
| Gross Unrealized Losses | (5,514) | (2,859) |
| Fair Value | 15,655,161 | 23,575,723 |
| Cash Equivalents | 5,991,869 | 5,497,788 |
| Short-Term Investments | 5,742,314 | 12,701,538 |
| Long-Term Investments | 3,920,978 | 5,376,397 |
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Cash And Cash Equivalents [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 5,751,965 | 5,497,788 |
| Fair Value | 5,751,965 | 5,497,788 |
| Cash Equivalents | 5,751,965 | 5,497,788 |
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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 | 5,751,965 | 5,497,788 |
| Fair Value | 5,751,965 | 5,497,788 |
| Cash Equivalents | 5,751,965 | 5,497,788 |
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Investments [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 9,885,193 | 18,037,968 |
| Gross Unrealized Gains | 23,517 | 42,826 |
| Gross Unrealized Losses | (5,514) | (2,859) |
| Fair Value | 9,903,196 | 18,077,935 |
| Cash Equivalents | 239,904 | |
| Short-Term Investments | 5,742,314 | 12,701,538 |
| Long-Term Investments | 3,920,978 | 5,376,397 |
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Investments [Member] | Certificates Of Deposit [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 4,024,031 | 8,157,749 |
| Gross Unrealized Gains | 687 | 3,727 |
| Gross Unrealized Losses | (4,992) | (1,945) |
| Fair Value | 4,019,726 | 8,159,531 |
| Cash Equivalents | 239,904 | |
| Short-Term Investments | 2,582,502 | 7,258,768 |
| Long-Term Investments | 1,197,320 | 900,763 |
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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 | 5,861,162 | 8,241,327 |
| Gross Unrealized Gains | 22,830 | 35,364 |
| Gross Unrealized Losses | (522) | (914) |
| Fair Value | 5,883,470 | 8,275,777 |
| Short-Term Investments | 3,159,812 | 3,800,143 |
| Long-Term Investments | 2,723,658 | 4,475,634 |
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Investments [Member] | Commercial Paper [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 1,638,892 | |
| Gross Unrealized Gains | 3,735 | |
| Fair Value | 1,642,627 | |
| Short-Term Investments | $ 1,642,627 |