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Cash, Cash Equivalents And Investments (Schedule Of Available-For-Sale Securities) (Details) (USD $)
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Mar. 31, 2013
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Dec. 31, 2012
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | $ 20,067,201 | $ 23,535,756 |
| Gross Unrealized Gains | 35,207 | 42,826 |
| Gross Unrealized Losses | (7,318) | (2,859) |
| Fair Value | 20,095,090 | 23,575,723 |
| Cash Equivalents | 3,211,661 | 5,497,788 |
| Short-Term Investments | 10,679,437 | 12,701,538 |
| Long-Term Investments | 6,203,992 | 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 | 3,211,661 | 5,497,788 |
| Fair Value | 3,211,661 | 5,497,788 |
| Cash Equivalents | 3,211,661 | 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 | 3,211,661 | 5,497,788 |
| Fair Value | 3,211,661 | 5,497,788 |
| Cash Equivalents | 3,211,661 | 5,497,788 |
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Investments [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 16,855,540 | 18,037,968 |
| Gross Unrealized Gains | 35,207 | 42,826 |
| Gross Unrealized Losses | (7,318) | (2,859) |
| Fair Value | 16,883,429 | 18,077,935 |
| Short-Term Investments | 10,679,437 | 12,701,538 |
| Long-Term Investments | 6,203,992 | 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 | 5,438,166 | 8,157,749 |
| Gross Unrealized Gains | 2,442 | 3,727 |
| Gross Unrealized Losses | (3,860) | (1,945) |
| Fair Value | 5,436,748 | 8,159,531 |
| Short-Term Investments | 4,477,193 | 7,258,768 |
| Long-Term Investments | 959,555 | 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 | 9,774,853 | 8,241,327 |
| Gross Unrealized Gains | 30,959 | 35,364 |
| Gross Unrealized Losses | (3,458) | (914) |
| Fair Value | 9,802,354 | 8,275,777 |
| Short-Term Investments | 4,557,917 | 3,800,143 |
| Long-Term Investments | 5,244,437 | 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 | 1,642,521 | 1,638,892 |
| Gross Unrealized Gains | 1,806 | 3,735 |
| Fair Value | 1,644,327 | 1,642,627 |
| Short-Term Investments | $ 1,644,327 | $ 1,642,627 |