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Cash, Cash Equivalents And Investments (Schedule Of Available-For-Sale Securities) (Details) (USD $)
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Jun. 30, 2013
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Dec. 31, 2012
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | $ 15,595,057 | $ 23,535,756 |
| Gross Unrealized Gains | 21,763 | 42,826 |
| Gross Unrealized Losses | (12,342) | (2,859) |
| Fair Value | 15,604,478 | 23,575,723 |
| Cash Equivalents | 3,365,196 | 5,497,788 |
| Short-Term Investments | 6,818,774 | 12,701,538 |
| Long-Term Investments | 5,420,508 | 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 | 3,365,196 | 5,497,788 |
| Fair Value | 3,365,196 | 5,497,788 |
| Cash Equivalents | 3,365,196 | 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 | 3,365,196 | 5,497,788 |
| Fair Value | 3,365,196 | 5,497,788 |
| Cash Equivalents | 3,365,196 | 5,497,788 |
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Investments [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 12,229,861 | 18,037,968 |
| Gross Unrealized Gains | 21,763 | 42,826 |
| Gross Unrealized Losses | (12,342) | (2,859) |
| Fair Value | 12,239,282 | 18,077,935 |
| Short-Term Investments | 6,818,774 | 12,701,538 |
| Long-Term Investments | 5,420,508 | 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 | 3,275,850 | 8,157,749 |
| Gross Unrealized Gains | 821 | 3,727 |
| Gross Unrealized Losses | (4,022) | (1,945) |
| Fair Value | 3,272,649 | 8,159,531 |
| Short-Term Investments | 2,312,463 | 7,258,768 |
| Long-Term Investments | 960,186 | 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 | 8,954,011 | 8,241,327 |
| Gross Unrealized Gains | 20,942 | 35,364 |
| Gross Unrealized Losses | (8,320) | (914) |
| Fair Value | 8,966,633 | 8,275,777 |
| Short-Term Investments | 4,506,311 | 3,800,143 |
| Long-Term Investments | 4,460,322 | 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 |