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Stock Option Plans (Tables)
3 Months Ended
Apr. 30, 2013
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] The following table summarizes options granted, exercised and canceled or expired during the three months ended April 30, 2013:
    Shares     Weighted
Average
Exercise
Price
    Weighted Average
Remaining
Contractual Term
(in years)
    Aggregate
Intrinsic
Value
(in thousands)
 
Outstanding at January 31, 2013     168,755     $ 12.46                  
Exercised     (43,305 )   $ 12.82                  
Outstanding and exercisable at April 30, 2013     125,450     $ 12.34       0.9     $ 797