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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
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