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Stock-Based Compensation (Details 1) (USD $) | 12 Months Ended
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Jan. 31, 2013 | Jan. 31, 2012
Summary of change in number of non-vested options to purchase shares of common stock |  |
Nonvested, Beginning balance, Shares | 212,500 | 237,000
Nonvested, Beginning balance, Weighted Average Fair Value | $ 5.09 | $ 6.31
Granted, Shares | 293,000 | 212,500
Granted, Weighted Average Fair Value | $ 5.65 | $ 5.09
Vested, Shares | (207,500) | (232,000)
Vested, Weighted Average Fair Value | $ 5.06 | $ 6.34
Forfeited, Shares | (5,000) | (5,000)
Forfeited, Weighted Average Fair Value | $ 6.32 | $ 4.98
Nonvested, Ending balance, Shares | 293,000 | 212,500
Nonvested, Ending balance, Weighted Average Fair Value | $ 5.65 | $ 5.09

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- Definition Share based compensation arrangement by share based payment award equity instruments options vested in period. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments options vested in period weighted average grant date fair value. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award option nonvested outstanding number of shares. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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