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Consolidated Statements of Comprehensive Income and Stockholders' Equity (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2010
Additional Paid-in Capital
      
Stock options exercised, shares 14,500 13,850 37,500
Stock options granted, shares 55,000 136,400 47,200
Treasury Stock
      
Stock options exercised, shares 14,500 13,850 37,500
Treasury stock, shares 13,306 8,323 20,959
Retained Earnings
      
Cash dividends declared, per share 0.40 0.40 0.38