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Stockholders' Equity (Detail Textuals) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 02, 2010 Director | Dec. 31, 2015 Quarter $ / shares shares | Sep. 30, 2015 $ / shares | Jun. 30, 2015 $ / shares | Mar. 31, 2015 $ / shares | Sep. 30, 2014 $ / shares | Jun. 30, 2014 $ / shares | Mar. 31, 2014 $ / shares | Dec. 31, 2013 $ / shares | Dec. 31, 2015 USD ($) Conversion_rate Quarter Director $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares
Stockholders' equity |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued | shares |  | 335,273 |  |  |  |  |  |  |  | 335,273 | 335,273
Preferred stock, shares outstanding | shares |  | 335,273 |  |  |  |  |  |  |  | 335,273 | 335,273
Preferred stock, par value (in dollars per share) |  | $ 0.001 |  |  |  |  |  |  |  | $ 0.001 | $ 0.001
Redemption price per share (in dollars per share) |  | $ 10 |  |  |  |  |  |  |  | $ 10 |
Dividend rate (as a percent) |  |  |  |  |  |  |  |  |  | 6.00% |
Deemed dividends recorded | $ |  |  |  |  |  |  |  |  |  |  |
Preferred stock |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued | shares |  | 335,273 |  |  |  |  |  |  |  | 335,273 |
Preferred stock, shares outstanding | shares |  | 335,273 |  |  |  |  |  |  |  | 335,273 |
Preferred stock, par value (in dollars per share) |  | $ 10 |  |  |  |  |  |  |  | $ 10 |
Liquidation preference (in dollars per share) |  | $ 10 |  |  |  |  |  |  |  | $ 10 |
Number of shares to be issued for each preferred stock upon conversion | Conversion_rate |  |  |  |  |  |  |  |  |  | 0.06079 |
Conversion price (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 164.50 |
Shares reserved for future issuance upon conversion | shares |  | 20,381 |  |  |  |  |  |  |  | 20,381 |
Number of trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 days in order for the preferred stock to be convertible |  |  |  |  |  |  |  |  |  | 30 days |
Number of trading days prior to notice of automatic conversion |  |  |  |  |  |  |  |  |  | 5 days |
Number of quarters in which no preferred stock dividends have been paid | Quarter |  | 6 |  |  |  |  |  |  |  | 6 |
Number of Board of Directors to be elected by Preferred Stock holders if entity fails to pay dividends on Preferred Stock | Director |  |  |  |  |  |  |  |  |  | 2 |
Number of Board of Directors elected by the Preferred Stock holders when the entity failed to pay dividends on Preferred Stock | Director | 2 |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 6.00% |  |  |  |  |  |  |  | 6.00% |
Debt principal amount per share, basis for exchange (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 10 |
Debt instrument, term |  |  |  |  |  |  |  |  |  | 25 years |
Dividend declared, date |  | Dec. 24, 2015 | Oct. 14, 2015 | May 22, 2015 | Feb. 18, 2015 |  |  |  |  |  |
Declared dividend per share |  | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 |
Dividend paid, date |  | Feb. 01, 2016 | Nov. 02, 2015 | Aug. 01, 2015 | May 01, 2015 | Nov. 03, 2014 | Aug. 01, 2014 | May 01, 2014 | Feb. 01, 2014 |  |
Dividend, record date |  | Jan. 21, 2016 | Oct. 23, 2015 | Jul. 17, 2015 | Apr. 17, 2015 |  |  |  |  |  |
Preferred stock | Minimum |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |  |  |
Closing price of stock (in dollars per share) |  | $ 246.75 |  |  |  |  |  |  |  | $ 246.75 |
Percentage of the closing sales price of the entity's common stock that the conversion price must exceed in order for the preferred stock to be convertible |  |  |  |  |  |  |  |  |  | 150.00% |
Number of trading days within 30 trading days in which the closing price of the entity's common stock must exceed the conversion price for the preferred stock to be convertible |  |  |  |  |  |  |  |  |  | 20 days |

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