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Cash, Cash Equivalents And Investments (Details) (Schedule Of Available-For-Sale Securities) (USD $)
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Sep. 30, 2012
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Dec. 31, 2011
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Sep. 30, 2011
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Dec. 31, 2010
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| Schedule of Available-for-sale Securities [Line Items] | ||||
| Amortized Cost | $ 36,335,784 | $ 46,043,216 | ||
| Gross Unrealized Gains | 37,706 | 8,213 | ||
| Gross Unrealized Losses | (6,615) | (16,608) | ||
| Fair Value | 36,366,875 | 46,034,821 | ||
| Cash & Cash Equivalents | 14,764,399 | 22,515,710 | 20,084,605 | 16,787,558 |
| Short-Term Investments | 14,539,329 | 18,635,601 | ||
| Long-Term Investments | 7,063,147 | 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 | 14,764,399 | 22,515,710 | ||
| Fair Value | 14,764,399 | 22,515,710 | ||
| Cash & Cash Equivalents | 14,764,399 | 22,515,710 | ||
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Cash And Cash Equivalents [Member] | Cash [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||||
| Amortized Cost | 12,832,100 | 21,685,829 | ||
| Fair Value | 12,832,100 | 21,685,829 | ||
| Cash & Cash Equivalents | 12,832,100 | 21,685,829 | ||
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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 | 1,932,299 | 829,881 | ||
| Fair Value | 1,932,299 | 829,881 | ||
| Cash & Cash Equivalents | 1,932,299 | 829,881 | ||
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Investments [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||||
| Amortized Cost | 21,571,385 | 23,527,506 | ||
| Gross Unrealized Gains | 37,706 | 8,213 | ||
| Gross Unrealized Losses | (6,615) | (16,608) | ||
| Fair Value | 21,602,476 | 23,519,111 | ||
| Short-Term Investments | 14,539,329 | 18,635,601 | ||
| Long-Term Investments | 7,063,147 | 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 | 12,064,679 | 23,527,506 | ||
| Gross Unrealized Gains | 4,720 | 8,213 | ||
| Gross Unrealized Losses | (3,573) | (16,608) | ||
| Fair Value | 12,065,826 | 23,519,111 | ||
| Short-Term Investments | 11,166,760 | 18,635,601 | ||
| Long-Term Investments | 899,066 | 4,883,510 | ||
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Investments [Member] | Corporate Notes/Bonds [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||||
| Amortized Cost | 6,868,754 | |||
| Gross Unrealized Gains | 27,956 | |||
| Gross Unrealized Losses | (703) | |||
| Fair Value | 6,896,007 | |||
| Short-Term Investments | 731,926 | |||
| Long-Term Investments | 6,164,081 | |||
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Investments [Member] | Municipal Notes/Bonds [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||||
| Amortized Cost | 1,002,769 | |||
| Gross Unrealized Losses | (2,339) | |||
| Fair Value | 1,000,430 | |||
| Short-Term Investments | 1,000,430 | |||
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Investments [Member] | Commercial Paper [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||||
| Amortized Cost | 1,635,183 | |||
| Gross Unrealized Gains | 5,030 | |||
| Fair Value | 1,640,213 | |||
| Short-Term Investments | $ 1,640,213 |