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Cash, Cash Equivalents And Investments (Schedule Of Available-For-Sale Securities) (Details) (USD $)
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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| Schedule of Available-for-sale Securities [Line Items] | ||||
| Amortized Cost | $ 23,535,756 | $ 24,357,387 | ||
| Gross Unrealized Gains | 42,826 | 8,213 | ||
| Gross Unrealized Losses | (2,859) | (16,608) | ||
| Fair Value | 23,575,723 | 24,348,992 | ||
| Cash Equivalents | 5,497,788 | 829,881 | ||
| Cash & Cash Equivalents | 17,869,712 | 22,515,710 | 16,787,558 | 21,293,448 |
| Short-Term Investments | 12,701,538 | 18,635,601 | ||
| Long-Term Investments | 5,376,397 | 4,883,510 | ||
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Cash And Cash Equivalents [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||||
| Amortized Cost | 5,497,788 | 829,881 | ||
| Fair Value | 5,497,788 | 829,881 | ||
| Cash Equivalents | 5,497,788 | 829,881 | ||
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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 | 5,497,788 | 829,881 | ||
| Fair Value | 5,497,788 | 829,881 | ||
| Cash Equivalents | 5,497,788 | 829,881 | ||
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Investments [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||||
| Amortized Cost | 18,037,968 | 23,527,506 | ||
| Gross Unrealized Gains | 42,826 | 8,213 | ||
| Gross Unrealized Losses | (2,859) | (16,608) | ||
| Fair Value | 18,077,935 | 23,519,111 | ||
| Short-Term Investments | 12,701,538 | 18,635,601 | ||
| Long-Term Investments | 5,376,397 | 4,883,510 | ||
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Investments [Member] | Certificates Of Deposit [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||||
| Amortized Cost | 8,157,749 | 23,527,506 | ||
| Gross Unrealized Gains | 3,727 | 8,213 | ||
| Gross Unrealized Losses | (1,945) | (16,608) | ||
| Fair Value | 8,159,531 | 23,519,111 | ||
| Short-Term Investments | 7,258,768 | 18,635,601 | ||
| Long-Term Investments | 900,763 | 4,883,510 | ||
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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 | 8,241,327 | |||
| Gross Unrealized Gains | 35,364 | |||
| Gross Unrealized Losses | (914) | |||
| Fair Value | 8,275,777 | |||
| Short-Term Investments | 3,800,143 | |||
| Long-Term Investments | 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 |