| Basic and diluted net loss per share | 
|  |  | Three
    Months Ended June 30, |  |  | Nine
    Months Ended June 30, |  |  
|  |  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  
| Loss from continuing
    operations |  | $ | (511,464 | ) |  | $ | (289,714 | ) |  | $ | (4,789,403 | ) |  | $ | (744,154 | ) |  
| Less:
    preferred stock dividends |  |  | (479 | ) |  |  | (479 | ) |  |  | (1,438 | ) |  |  | (1,438 | ) |  
| Loss from continuing operations
    applicable to common stock |  |  | (511,943 | ) |  |  | (290,193 | ) |  |  | (4,790,841 | ) |  |  | (745,592 | ) |  
| Income
    (loss) from discontinued operations |  |  | 295 |  |  |  | 7,944 |  |  |  | 2,708 |  |  |  | 11,753 |  |  
| Net
    loss applicable to common stock |  | $ | (511,648 | ) |  | $ | (282,249 | ) |  | $ | (4,788,133 | ) |  | $ | (733,839 | ) |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
| Weighted average common
    shares outstanding - basic and diluted |  |  | 3,437,736 |  |  |  | 2,402,168 |  |  |  | 2,914,898 |  |  |  | 1,928,589 |  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
| Earnings per share - basic
    and diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
| Loss
    from continuing operations |  | $ | (0.15 | ) |  | $ | (0.12 | ) |  | $ | (1.64 | ) |  | $ | (0.39 | ) |  
| Discontinued
    operations |  |  | 0.00 |  |  |  |  |  |  |  | 0.00 |  |  |  | 0.01 |  |  
| Net
    loss |  | $ | (0.15 | ) |  | $ | (0.12 | ) |  | $ | (1.64 | ) |  | $ | (0.38 | ) |  | 
| Potentially dilutive securities | 
|  |  | Three Months Ended
    June 30, |  |  | Nine Months Ended
    June 30, |  |  
|  |  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  
| Options to purchase shares of
    common stock |  |  | 225,000 |  |  |  | 10,526 |  |  |  | 225,000 |  |  |  | 10,526 |  |  
| Warrants to purchase shares of common stock |  |  | 955,502 |  |  |  | 98,971 |  |  |  | 955,502 |  |  |  | 98,971 |  |  
| Series E convertible preferred stock |  |  | 127,840 |  |  |  | 127,840 |  |  |  | 127,840 |  |  |  | 127,840 |  |  
| Shares of non-vested
    restricted stock |  |  | 263 |  |  |  | 1,342 |  |  |  | 263 |  |  |  | 1,342 |  |  
| Total potentially dilutive
    shares |  |  | 1,308,605 |  |  |  | 238,679 |  |  |  | 1,308,605 |  |  |  | 238,679 |  |  |