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Preferred Stock (Details) (USD $) | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended |  | 0 Months Ended | 12 Months Ended |  | 0 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Mar. 25, 2004 5% preferred stock item | Dec. 31, 2012 5% preferred stock | Mar. 25, 2004 5% preferred stock CEO | Mar. 25, 2004 5% preferred stock Director | Mar. 28, 2005 Series 2 5% preferred stock | Dec. 31, 2012 Series 2 5% preferred stock | Mar. 28, 2005 Series 2 5% preferred stock Minimum | Mar. 28, 2005 Series 2 5% preferred stock CEO | Mar. 28, 2005 Series 2 5% preferred stock Director | Mar. 28, 2005 Series 2 5% preferred stock CFO | Dec. 02, 2005 Series 3 5% preferred stock | Dec. 31, 2012 Series 3 5% preferred stock | Dec. 02, 2005 Series 3 5% preferred stock Minimum | Dec. 02, 2005 Series 3 5% preferred stock CEO | Dec. 02, 2005 Series 3 5% preferred stock Director | Dec. 02, 2005 Series 3 5% preferred stock CFO
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate (as a percent) |  |  | 5.00% |  |  |  | 5.00% |  |  |  |  |  | 5.00% |  |  |  |  |
Value of shares issued under private placement |  |  | $ 5,000,000 |  |  |  | $ 2,700,000 |  |  |  |  |  | $ 1,200,000 |  |  |  |  |
Shares issued under private placement |  |  | 1,000,000 |  | 140,000 | 60,000 | 1,065,200 |  |  | 260,000 | 60,000 | 100,000 | 564,607 |  |  | 123,853 | 27,523 | 68,808
Share issued price (in dollars per share) |  |  | $ 5.00 |  |  |  | $ 2.50 |  |  |  |  |  | $ 2.18 |  |  |  |  |
Issuance costs incurred for shares issued |  |  | 275,000 |  |  |  | 173,000 |  |  |  |  |  | 100,000 |  |  |  |  |
Shares of common stock issued upon conversion of preferred stock |  |  | 1,590,331 |  |  |  | 1,065,200 |  |  |  |  |  | 564,607 |  |  |  |  |
Conversion price per share (in dollars per share) |  |  | $ 3.144 |  |  |  | $ 2.50 |  |  |  |  |  | $ 2.18 |  |  |  |  |
Number of votes per share that holders of preferred stock will receive |  |  | 1.5903 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidation preference value preferred stock price per share |  |  | $ 5.00 |  |  |  | $ 2.50 |  |  |  |  |  | $ 2.18 |  |  |  |  |
Redemption price per share (in dollars per share) |  |  | $ 5.00 |  |  |  |  |  | $ 3.25 |  |  |  |  |  | $ 2.834 |  |  |
Shares outstanding |  |  |  | 220,000 |  |  |  | 460,000 |  |  |  |  |  | 354,056 |  |  |  |
Dividends Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends accrued during the period | 152,000 | 151,000 |  | 55,000 |  |  |  | 57,000 |  |  |  |  |  | 39,000 |  |  |  |
Accrued and unpaid dividends | $ 279,000 | $ 123,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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