4. Stockholders' Equity	3 Months Ended
Jul. 31, 2019
Equity [Abstract]
Stockholders' Equity	Note 4 – Stockholders’ Equity Series E Preferred Stock Dividend On June 5, 2019, our Board of Directors declared a quarterly cash dividend of $0.65625 per share on our 10.50% Series E Convertible Preferred Stock (the “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, 2019 through June 30, 2019. The cash dividend of $1.1 million was paid on July 1, 2019 to holders of the Series E Preferred Stock of record on June 17, 2019. Each share of Series E Preferred Stock is convertible into a whole number of shares of our common stock determined by dividing the liquidation preference of $25.00 per share by the conversion price, currently $21.00 per share. As of July 31, 2019, if all of our issued and outstanding shares of Series E Preferred Stock were converted at the $21.00 per share conversion price, the holders of our Series E Preferred Stock would receive an aggregate of 1,961,619 shares of our common stock. However, we have reserved the maximum number of shares of our common stock that could be issued upon a change of control event assuming our shares of common stock are acquired for consideration of $5.985 per share or less. In this scenario, each outstanding share of our Series E Preferred Stock could be converted into 4.14 shares of our common stock, or 6,826,435 in aggregate.

4. Stockholders' Equity

3 Months Ended

Jul. 31, 2019

Note 4 – Stockholders’ Equity

Series E Preferred Stock Dividend

On June 5, 2019, our Board of Directors declared a quarterly cash dividend of $0.65625 per share on our 10.50% Series E Convertible Preferred Stock (the “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, 2019 through June 30, 2019. The cash dividend of $1.1 million was paid on July 1, 2019 to holders of the Series E Preferred Stock of record on June 17, 2019.

Each share of Series E Preferred Stock is convertible into a whole number of shares of our common stock determined by dividing the liquidation preference of $25.00 per share by the conversion price, currently $21.00 per share. As of July 31, 2019, if all of our issued and outstanding shares of Series E Preferred Stock were converted at the $21.00 per share conversion price, the holders of our Series E Preferred Stock would receive an aggregate of 1,961,619 shares of our common stock. However, we have reserved the maximum number of shares of our common stock that could be issued upon a change of control event assuming our shares of common stock are acquired for consideration of $5.985 per share or less. In this scenario, each outstanding share of our Series E Preferred Stock could be converted into 4.14 shares of our common stock, or 6,826,435 in aggregate.