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Shareholders' Equity (Details 1) (USD $) | 12 Months Ended
--- | ---
Jan. 31, 2013 | Jan. 31, 2012
Aggregated information regarding stock options granted |  |
Beginning balance, Number of Shares | 888,097 |
Beginning balance, Weighted Average Option Price Per Share | $ 8.27 |
Options Granted, Number of Shares | 144,000 |
Options Granted, Weighted Average Option Price Per Share | $ 8.09 |
Options Exercised, Number of Shares | (66,313) | (289,417)
Options Exercised, Weighted Average Option Price Per Share | $ 5.15 |
Options Expired, Number of Shares | (49,172) |
Options Expired, Weighted Average Option Price Per Share | $ 8.39 |
Ending balance, Number of Shares | 916,612 | 888,097
Ending balance, Weighted Average Option Price Per Share | $ 8.46 | $ 8.27
Exercisable, Number of Options | 711,112 |
Options Exercisable, Weighted Average Option Price Per Share | $ 8.64 |
Range One [Member] |  |
Aggregated information regarding stock options granted |  |
Options Outstanding, Option Price Per Share lower range, Ending balance |  | $ 2.40
Options Outstanding, Option Price Per Share upper range, Ending balance |  | $ 11.90
Range Two [Member] |  |
Aggregated information regarding stock options granted |  |
Options Granted, Option Price Per Share, Lower range | $ 7.91 |
Options Granted, Option Price Per Share, Upper range | $ 8.35 |
Range Three [Member] |  |
Aggregated information regarding stock options granted |  |
Options Exercised, Option Price Per Share, Lower range | $ 2.40 |
Options Exercised, Option Price Per Share, Upper range | $ 8.95 |
Range Four [Member] |  |
Aggregated information regarding stock options granted |  |
Options Expired, Option Price Per Share, Lower range | $ 2.69 |
Options Expired, Option Price Per Share, Upper range | $ 11.90 |
Range Five [Member] |  |
Aggregated information regarding stock options granted |  |
Options Outstanding, Option Price Per Share lower range, Ending balance | $ 2.40 |
Options Outstanding, Option Price Per Share upper range, Ending balance | $ 11.90 |
Range Six [Member] |  |
Aggregated information regarding stock options granted |  |
Options Exercisable, Option Price Per Share, Lower range | $ 2.40 |
Options Exercisable, Option Price Per Share, Upper range | $ 11.90 |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -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(1)(c), d(2) -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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