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12. Employee Benefit Plans (Tables) (Employee Stock Option [Member])
 12 Months Ended
Apr. 30, 2013
Employee Stock Option [Member]
  
12. Employee Benefit Plans (Tables) [Line Items]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] The following table summarizes information about stock option activity for the years ended April 30:

   
Stock Options and Stock Appreciation Rights
 
   
Shares
   
Weighted- Average
Exercise Price
 
Weighted Average
Remaining
Contractual Term
 
Aggregate
Intrinsic Value
 
Outstanding – May 1, 2011
    1,433,525     $ 8.22  
6.6 years
     
Granted
    253,000       7.36          
Exercised
    (7,950 )     5.35          
Expired or Canceled
    (48,875 )     11.10          
Outstanding – April 30, 2012
    1,629,700     $ 7.95  
6.4 years
     
Granted
    209,000       8.82          
Exercised
    (113,075 )     5.63          
Expired or Canceled
    (17,000 )     5.16          
Outstanding – April 30, 2013
    1,708,625     $ 8.23  
6.1 years
  $ 3,697,430  
Exercisable
    1,081,000     $ 8.46  
4.8 years
  $ 2,324,626  
Available for future grants
    166,743