Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation and Stock Incentive Plans (Details Textual)

v2.4.0.6
Stock-Based Compensation and Stock Incentive Plans (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2012
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Description       Option awards may be granted to employees at an exercise price per share of not less than 100% of the fair market value per common share on the date of the grant.
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 years
Share Based Compensation Arrangement By Share Based Payment Award Award Expiration Period       7 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 875,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number   437,500   437,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value     $ 2.8 $ 3.3
Stock Option Value Per Share   $ 3.78   $ 3.78
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period   2 years 1 month 6 days    
Fair Value Assumptions, Risk Free Interest Rate       1.22%