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Stockholders' Equity (Details) (USD $) | 0 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 04, 2011 | Dec. 31, 2012 | Dec. 31, 2011
Equity, Class of Treasury Stock [Line Items] |  |  |
Maximum number of common shares authorized to be repurchased (in shares) |  |  | 100,000
Total number of shares authorized and available for repurchase (in shares) |  |  | 540,000
Number of shares repurchased (in shares) |  | 50,454 |
Repurchased common stock, value |  | $ 405,000 | $ 315,000
Stock issued during period (in shares) | 350,000 |  |
Stock issued price per share (in dollars per share) | $ 20 |  |
Additional shares sold through exercise by underwriter of over-allotment option (in shares) |  | 0 | 0
Net proceeds from public offering |  | 0 | 6,562,000
Net Proceeds from Issuance of Common Stock | $ 6,404,000 |  |
Common stock [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Additional shares sold through exercise by underwriter of over-allotment option (in shares) | 45,652 |  |

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