4. Stockholders' Equity	9 Months Ended
Jan. 31, 2020
Equity [Abstract]
Stockholders' Equity	Note 4 – Stockholders’ Equity Termination of Rights Agreement (Series D Preferred Stock) On March 16, 2006, we entered into a Rights Agreement with Rights Agent named therein, which agreement was subsequently amended and restated on March 16, 2016 (as amended, the “Rights Agreement”). The Rights Agreement was designed to strengthen the ability of our Board of Directors to protect the interests of our stockholders against potential abusive or coercive takeover tactics and to enable all stockholders to receive the full and fair value of their investment in the event that an unsolicited attempt is made to acquire us. Under the Rights Agreement, our Board of Directors declared a dividend of one preferred share purchase right (the “Right”) for each share of our common stock held by our stockholders of record as of the close of business on March 27, 2006, each of which Right entitled the holder thereof to purchase a fraction of a share of our Series D Participating Preferred Stock, par value $0.001 per share, at the price specified in the Rights Agreement. The Rights were only exercisable if a person or group acquired 15% or more of our outstanding common stock or announced a tender offer or exchange offer which, if consummated, would have resulted in ownership by a person or group of 15% or more of our outstanding stock. On September 23, 2019, the Rights Agreement was further amended to accelerate the scheduled expiration date of the Rights Agreement from the close of business on March 16, 2021 to the close of business on September 23, 2019, and effectively terminate the Rights Agreement and the Rights granted thereunder as of such expiration date. Our Board of Directors elected to terminate the Rights Agreement and the Rights granted thereunder based on their recent evaluation of the effectiveness of, and the need for, a stockholder rights plan and consideration of current corporate governance practices and proxy advisory guidelines. In connection with the termination of the Rights Agreement, we filed a Notification of Removal from Listing and/or Registration under Section 12(b) of the Securities Exchange Act on Form 25 with the SEC on September 23, 2019, in order to withdraw the Rights from registration under Section 12(b) of the Securities Exchange Act of 1934, as amended, which deregistration was effective 90 days after the filing date. Series E Preferred Stock Each share of issued and outstanding 10.50% Series E Convertible Preferred Stock $0.001 par value per share (“Series E Preferred Stock”) is convertible into a number of shares of our common stock determined by dividing the liquidation preference of $25.00 per share Series E Preferred Stock by the then-current conversion price per share, currently $21.00 per share, rounded down to the nearest whole number. As of January 31, 2020, if all of our issued and outstanding shares of Series E Preferred Stock were converted at the conversion price of $21.00 per share, the holders of our Series E Preferred Stock would receive an aggregate of 1,961,619 shares of our common stock. However, because the conversion price of our Series E Preferred Stock is subject to adjustment from time to time in accordance with the applicable provisions of our certificate of incorporation, we have reserved the maximum number of shares of our common stock that could be issued upon the conversion of our Series E Preferred Stock 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 would be converted into 4.14 shares of our common stock, or 6,826,435 shares in the aggregate. Dividends Holders of our Series E Preferred Stock are entitled to receive cumulative dividends at the rate of 10.50% per annum based on the liquidation preference of $25.00 per share, or $2.625 per annum per share, which dividends are payable quarterly in cash, on or about the 1^st day of each January, April, July and October. For the three and nine months ended January 31, 2020 and 2019, we paid aggregate cash dividends of $1.1 million and $3.2 million, respectively, for issued and outstanding shares of our Series E Preferred Stock.

4. Stockholders' Equity

9 Months Ended

Jan. 31, 2020

Note 4 – Stockholders’ Equity

Termination of Rights Agreement (Series D Preferred Stock)

On March 16, 2006, we entered into a Rights Agreement with Rights Agent named therein, which agreement was subsequently amended and restated on March 16, 2016 (as amended, the “Rights Agreement”). The Rights Agreement was designed to strengthen the ability of our Board of Directors to protect the interests of our stockholders against potential abusive or coercive takeover tactics and to enable all stockholders to receive the full and fair value of their investment in the event that an unsolicited attempt is made to acquire us. Under the Rights Agreement, our Board of Directors declared a dividend of one preferred share purchase right (the “Right”) for each share of our common stock held by our stockholders of record as of the close of business on March 27, 2006, each of which Right entitled the holder thereof to purchase a fraction of a share of our Series D Participating Preferred Stock, par value $0.001 per share, at the price specified in the Rights Agreement. The Rights were only exercisable if a person or group acquired 15% or more of our outstanding common stock or announced a tender offer or exchange offer which, if consummated, would have resulted in ownership by a person or group of 15% or more of our outstanding stock.

On September 23, 2019, the Rights Agreement was further amended to accelerate the scheduled expiration date of the Rights Agreement from the close of business on March 16, 2021 to the close of business on September 23, 2019, and effectively terminate the Rights Agreement and the Rights granted thereunder as of such expiration date. Our Board of Directors elected to terminate the Rights Agreement and the Rights granted thereunder based on their recent evaluation of the effectiveness of, and the need for, a stockholder rights plan and consideration of current corporate governance practices and proxy advisory guidelines. In connection with the termination of the Rights Agreement, we filed a Notification of Removal from Listing and/or Registration under Section 12(b) of the Securities Exchange Act on Form 25 with the SEC on September 23, 2019, in order to withdraw the Rights from registration under Section 12(b) of the Securities Exchange Act of 1934, as amended, which deregistration was effective 90 days after the filing date.

Series E Preferred Stock

Each share of issued and outstanding 10.50% Series E Convertible Preferred Stock $0.001 par value per share (“Series E Preferred Stock”) is convertible into a number of shares of our common stock determined by dividing the liquidation preference of $25.00 per share Series E Preferred Stock by the then-current conversion price per share, currently $21.00 per share, rounded down to the nearest whole number. As of January 31, 2020, if all of our issued and outstanding shares of Series E Preferred Stock were converted at the conversion price of $21.00 per share, the holders of our Series E Preferred Stock would receive an aggregate of 1,961,619 shares of our common stock. However, because the conversion price of our Series E Preferred Stock is subject to adjustment from time to time in accordance with the applicable provisions of our certificate of incorporation, we have reserved the maximum number of shares of our common stock that could be issued upon the conversion of our Series E Preferred Stock 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 would be converted into 4.14 shares of our common stock, or 6,826,435 shares in the aggregate.

Dividends

Holders of our Series E Preferred Stock are entitled to receive cumulative dividends at the rate of 10.50% per annum based on the liquidation preference of $25.00 per share, or $2.625 per annum per share, which dividends are payable quarterly in cash, on or about the 1^st day of each January, April, July and October. For the three and nine months ended January 31, 2020 and 2019, we paid aggregate cash dividends of $1.1 million and $3.2 million, respectively, for issued and outstanding shares of our Series E Preferred Stock.