12. SUBSEQUENT EVENTS	12 Months Ended
Apr. 30, 2016
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	Sale of Common Stock Equity Distribution Agreement - Subsequent to April 30, 2016 and through July 14, 2016, we sold 2,649,318 shares of common stock at market prices under the Equity Distribution Agreement (Note 5) for aggregate gross proceeds of $1,232,000. As of July 14, 2016, aggregate gross proceeds of $11,799,000 remained available under the Equity Distribution Agreement. August 2015 AMI Sales Agreement - Subsequent to April 30, 2016 and through July 14, 2016, we sold 1,876,918 shares of common stock at market prices under the August 2015 AMI Sales Agreement (Note 5) for aggregate gross proceeds of $937,000. As of July 14, 2016, aggregate gross proceeds of $21,616,000 remained available under the August 2015 AMI Sales Agreement. Broad Based Annual Grant of Stock Options On June 2, 2016, our Compensation Committee of the Board of Directors approved a broad based annual grant of stock options for fiscal year 2017 to substantially all of our employees, our three non-employee directors and one consultant to purchase an aggregate of 6,412,057 shares of our common stock at an exercise price of $0.5001. These stock options were granted under our 2011 Stock Incentive Plan and vest quarterly in equal installments over a two year period. Series E Preferred Stock Dividend On June 2, 2016, our Board of Directors declared a quarterly cash dividend of $0.65625 per share on our Series E Preferred Stock. The dividend payment is equivalent to an annualized 10.50% per share, based on the $25.00 per share stated liquidation preference, accruing from April 1, 2016 through June 30, 2016. The cash dividend of $1,035,000 was paid on July 1, 2016 to holders of the Series E Preferred Stock of record on June 17, 2016.

12. SUBSEQUENT EVENTS

12 Months Ended

Apr. 30, 2016

Sale of Common Stock

Equity Distribution Agreement - Subsequent to April 30, 2016 and through July 14, 2016, we sold 2,649,318 shares of common stock at market prices under the Equity Distribution Agreement (Note 5) for aggregate gross proceeds of $1,232,000. As of July 14, 2016, aggregate gross proceeds of $11,799,000 remained available under the Equity Distribution Agreement.

August 2015 AMI Sales Agreement - Subsequent to April 30, 2016 and through July 14, 2016, we sold 1,876,918 shares of common stock at market prices under the August 2015 AMI Sales Agreement (Note 5) for aggregate gross proceeds of $937,000. As of July 14, 2016, aggregate gross proceeds of $21,616,000 remained available under the August 2015 AMI Sales Agreement.

Broad Based Annual Grant of Stock Options

On June 2, 2016, our Compensation Committee of the Board of Directors approved a broad based annual grant of stock options for fiscal year 2017 to substantially all of our employees, our three non-employee directors and one consultant to purchase an aggregate of 6,412,057 shares of our common stock at an exercise price of $0.5001. These stock options were granted under our 2011 Stock Incentive Plan and vest quarterly in equal installments over a two year period.

Series E Preferred Stock Dividend

On June 2, 2016, our Board of Directors declared a quarterly cash dividend of $0.65625 per share on our Series E Preferred Stock. The dividend payment is equivalent to an annualized 10.50% per share, based on the $25.00 per share stated liquidation preference, accruing from April 1, 2016 through June 30, 2016. The cash dividend of $1,035,000 was paid on July 1, 2016 to holders of the Series E Preferred Stock of record on June 17, 2016.