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Earnings Per Share
 9 Months Ended
Jan. 31, 2015
Earnings Per Share [Abstract]  
Earnings Per Share

B. Earnings Per Share

Basic earnings per share is based on the weighted average number of common shares outstanding during the three and nine month periods. Diluted earnings per share reflects the assumed exercise and conversion of outstanding options under the Company’s stock option plans, except when options have an anti-dilutive effect. Options to purchase 70,800 shares were not included in the computation of diluted earnings per share for the three and nine month periods ended January 31, 2015, because the option exercise prices were greater than the average market price of the common shares at that date, and accordingly, such options would have an antidilutive effect. Options to purchase 36,600 shares were not included in the computation of diluted earnings per share for the three and nine month periods ended January 31, 2014, because the effect would be anti-dilutive.