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Stockholders' Equity (Tables)
9 Months Ended
Jan. 31, 2013
Stockholders' Equity Attributable to Parent [Abstract]  
Schedule of Stock by Class [Table Text Block]
 
2013
2012
Balance, May 1
5,515,750

5,828,650

Restricted stock activity

(312,900
)
Treasury stock activity


Balance, January 31
5,515,750

5,515,750