Preferred Stock	9 Months Ended
Jan. 31, 2013
Preferred Stock [Abstract]
Preferred Stock	11. Preferred Stock In June 2011, the Company issued through a private placement 1,666,667 shares of preferred stock to a group of related party institutional investors at a price of $2.40 per share for a total of $4.0 million. The preferred stock will automatically convert on a 1-for-1 basis into shares of common stock of the Company upon the earlier of the second anniversary of the financing, June 30, 2013, or the date on which the Company’s common stock has an average closing price above $4.00 per share during the preceding 30 trading days. The preferred stock includes an annual dividend of 10% payable in cash or stock at the Company’s option. The preferred stock has no other provisions or preferences. During the nine months ended January 31, 2013, the Company paid $66,000 in preferred stock dividends ($0.04 per preferred share). As of January 31, 2013, the Company had accrued $236,000 of dividends payable on preferred stock included in other accrued liabilities.

11. Preferred Stock

In June 2011, the Company issued through a private placement 1,666,667 shares of preferred stock to a group of related party institutional investors at a price of $2.40 per share for a total of $4.0 million. The preferred stock will automatically convert on a 1-for-1 basis into shares of common stock of the Company upon the earlier of the second anniversary of the financing, June 30, 2013, or the date on which the Company’s common stock has an average closing price above $4.00 per share during the preceding 30 trading days. The preferred stock includes an annual dividend of 10% payable in cash or stock at the Company’s option. The preferred stock has no other provisions or preferences. During the nine months ended January 31, 2013, the Company paid $66,000 in preferred stock dividends ($0.04 per preferred share). As of January 31, 2013, the Company had accrued $236,000 of dividends payable on preferred stock included in other accrued liabilities.