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Common Stock (Details Textual) (USD $) | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jan. 31, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Stock Issued During Period, Shares, New Issues | 1,725,000 |  |  |
Sale Of Stock, Price Per Share (in dollars per share) | $ 27.25 |  |  |
Proceeds From Issuance Of Common Stock (in dollars) | $ 45,000,000 | $ 44,802,340 | $ 35,042,235 |
Common Stock, Par or Stated Value Per Share |  | $ 0.0001 |  | $ 0.0001
Common Stock, Shares Authorized |  | 28,000,000 |  | 15,850,000
Excess Stock Par Or Stated Value Per Share |  | $ 0.0001 |  | $ 0.0001
Excess Stock, Shares Authorized |  | 8,000,000 |  | 4,000,000
Shares Authorized |  | 40,000,000 |  |
Shares Authorized Par Or Stated Value Per Share |  | $ 0.0001 |  |
Series A Junior Participating Preferred Stock [Member] |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  | $ 0.0001 |  | $ 0.0001
Preferred Stock, Shares Authorized |  | 150,000 |  | 150,000
Preferred Stock [Member] |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  | $ 0.0001 |  | $ 0.0001
Preferred Stock, Shares Authorized |  | 4,000,000 |  | 150,000
Over Allotment Option [Member] |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction | 225,000 |  |  |

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