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Note H - Weighted Average Shares Outstanding (Tables)
 3 Months Ended
Jul. 31, 2015
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
  Three Months Ended
July 31,
    2015   2014
Weighted average shares outstanding-basic     8,513,440       8,716,344  
Dilutive options and restricted stock     396,157       426,718  
Weighted average shares outstanding-diluted     8,909,597       9,143,062  
Antidilutive securities not included:                
Options     258,000       70,000