Note 4 - Stock-based Compensation

6 Months Ended

Oct. 31, 2015

Notes to Financial Statements

Disclosure of Compensation Related Costs, Share-based Payments [Text Block]

4

. STOCK-BASED COMPENSATION

During the six months ended October 31, 2015, options to purchase 3,000 shares of common stock were granted (weighted average exercise price of $9.59 per share), options to purchase 44,380 shares were exercised (weighted average exercise price of $9.95 per share) and options to purchase 10,140 shares were cancelled (weighted average exercise price of $16.24). At October 31, 2015, options to purchase 561,615 shares (weighted average exercise price of $11.23 per share) were outstanding and stock-based awards to purchase 2,786,229 shares of common stock were available for grant.