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Stock-Based Compensation (Details Textual) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2003 Person | Jan. 31, 2013 | Jan. 31, 2012
Stock-Based Compensation (Textual) [Abstract] |  |  |
Compensation expense |  | $ 1,316,000 | $ 637,000
Intrinsic value of the stock options exercised |  | 1,242,000 | 238,000
Intrinsic value of outstanding stock options |  | 4,130,000 |
Stock options awarded |  | $ 17.36 | $ 13.92
Intrinsic value of exercisable stock options |  | 3,709,000 |
Stock Based Compensation (Additional Textual) [Abstract] |  |  |
Method used for fair value assumption |  | Black-Scholes option-pricing model |
Warrants converted |  | 160,000 |
Conversion price for outstanding warrants |  | 7.75 |
Number of individual to whom warrants issued | 3 |  |
Aggregate fair value of the warrants | 849,000 |  |
Total fair value amounts for stock options vested |  | 1,050,000 | 1,470,000
Company's expense for defined contribution savings plans |  | 36,000 | 31,000
Volatility Rate, Minimum |  | 1.82% | 1.98%
Volatility Rate, Maximum |  | 2.01% | 3.42%
Stock options awarded, Minimum |  | 34.50% | 36.10%
Stock options awarded, Maximum |  | 36.40% | 57.60%
Stock Option Plan [Member] |  |  |
Stock-Based Compensation (Textual) [Abstract] |  |  |
Expiration dates of stock incentive plans |  | 2011-07 |
Stock Plan [Member] |  |  |
Stock-Based Compensation (Textual) [Abstract] |  |  |
Number of shares of common stock authorized for grant during the period |  |  | 500,000
Number of shares of common stock available for award at January 31, 2013 |  | 81,500 |
Expiration dates of stock incentive plans |  | 2021-07 |
Unrecognized compensation cost |  | 1,049,000 |
ISOs [Member] |  |  |
Stock-Based Compensation (Textual) [Abstract] |  |  |
Incentive stock option award maximum expiration period |  |  | 10 years
Incentive stock option award minimum expiration period |  |  | 7 years
Period to become exercisable |  |  | 1 year
NSOs [Member] |  |  |
Stock-Based Compensation (Textual) [Abstract] |  |  |
Incentive stock option award maximum expiration period |  |  | 10 years
Period to become exercisable |  |  | 1 year
Restricted Stock [Member] |  |  |
Stock-Based Compensation (Textual) [Abstract] |  |  |
Restricted stock awarded to employee |  |  | 5,000
Market value of the shares amortized |  | $ 25,000 | $ 15,000
Vesting period |  |  | 2 years

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- Definition Aggregate amount of each class of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -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 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) -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. + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset or liability could be bought or incurred or sold or settled in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(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. + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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