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Stockholders' Equity (Common Stock) (Details) (USD $) | 1 Months Ended | 2 Months Ended | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 2 Months Ended | 12 Months Ended | 3 Months Ended
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Feb. 29, 2012 | Dec. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jan. 11, 2013 | Dec. 31, 2012 Common Stock [Member] | Dec. 31, 2011 Common Stock [Member] | Dec. 31, 2012 7.5% Series A-1 Convertible Preferred Stock [Member] | Dec. 31, 2011 7.5% Series A-1 Convertible Preferred Stock [Member] | Dec. 31, 2010 7.5% Series A-1 Convertible Preferred Stock [Member] Common Stock [Member] | Dec. 31, 2012 7.5% Series A-2 Convertible Preferred Stock [Member] Common Stock [Member] | Oct. 31, 2010 7.5% Series B Convertible Preferred Stock [Member] | Dec. 31, 2012 7.5% Series B Convertible Preferred Stock [Member] Common Stock [Member] | Dec. 31, 2010 7.5% Series B Convertible Preferred Stock [Member] Common Stock [Member] | Jan. 31, 2013 Common Stock [Member] | Feb. 29, 2012 Common Stock [Member] | Dec. 31, 2012 Common Stock [Member] | Dec. 31, 2012 Common Stock [Member] | Mar. 15, 2013 Common Stock [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of dividends, shares |  |  |  |  |  |  | 2,148,934 | 1,174,604 |  |  |  |  |  |  |  | 958,974 |  |  | 2,148,934 |
Payment of dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,173,557 |  |  | $ 4,457,262 |
Gross proceeds from the issuance of common stock | 17,250,000 | 9,300,000 | 24,349,203 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from the issuance of common stock, net of issuance costs | 15,300,000 | 8,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  |  |  |  |  |  | 862.5 | 862.5 |  |  | 35,749 |  |  |  | 9,078,948 | 4,246,573 |  |
Common stock issued price, per share | $ 1.9 | $ 2.19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of issuance costs | 1,900,000 | 1,000,000 | 658,078 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriting expenses | 1,400,000 | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of preferred stock to common stock, shares |  |  |  |  |  |  |  |  |  |  |  | 1,401 |  | 1,508 |  |  |  |  |  | 2,220
Common stock shares issued as a result of conversion of Preferred stock |  |  |  |  |  |  |  |  |  |  |  | 2,152,217 |  | 913,910 |  |  |  |  |  | 2,601,021
Amount of offer covered by registration statement |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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