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Nature of Operations (Details Textuals) (USD $)
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Jun. 30, 2012
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Dec. 31, 2011
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Jun. 30, 2011
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Dec. 31, 2010
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Mar. 30, 2012
Silicon Valley Bank
credit facility
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|---|---|---|---|---|---|
| Line of Credit Facility [Line Items] | |||||
| Working Capital | $ 25,500,000 | ||||
| Cash and cash equivalents | 15,851,417 | 13,856,893 | 27,151,258 | 10,955,403 | |
| Increase in credit facility | $ 15,000,000 |