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Stockholders' Equity (Tables)
6 Months Ended
Oct. 31, 2012
Stockholders' Equity Attributable to Parent [Abstract]  
Schedule of Stock by Class [Table Text Block]
 
2012
2011
Balance, May 1
5,515,750

5,828,650

Restricted stock activity


Treasury stock activity


Balance, October 31
5,515,750

5,828,650