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Note N - Quarterly Results of Operations (unaudited) (Details) - Quarterly Results of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Apr. 30, 2013
Jan. 31, 2013
Oct. 31, 2012
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Quarterly Results of Operations [Abstract]                      
Revenues $ 125,535 $ 118,922 $ 110,219 $ 110,000 $ 113,481 $ 105,365 $ 110,807 $ 100,524 $ 464,676 $ 430,177 $ 379,251
Gross profit 47,269 45,274 41,990 42,112 42,723 39,659 42,321 38,762 176,645 163,465  
Net income 8,789 7,980 7,278 8,118 9,641 7,304 7,760 8,282 32,165 32,987 28,215
Net income attributable to common stockholders $ 8,779 $ 7,970 $ 7,268 $ 8,108 $ 9,631 $ 7,294 $ 7,750 $ 8,272 $ 32,125 $ 32,947 $ 28,175
Earnings per share:                      
Basic (in Dollars per share) $ 0.97 $ 0.88 $ 0.80 $ 0.87 $ 1.01 $ 0.76 $ 0.79 $ 0.81 $ 3.53 $ 3.36 $ 2.59
Diluted (in Dollars per share) $ 0.92 $ 0.84 $ 0.76 $ 0.83 $ 0.97 $ 0.73 $ 0.77 $ 0.78 $ 3.36 $ 3.24 $ 2.54