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Shareholders' Equity - Additional Information (Detail) (USD $) | 12 Months Ended
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Jan. 31, 2014 | Jan. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock repurchased, shares | 0 | 110,000
Common stock shares repurchased, value |  | $ 770,000
Common stock shares additional authorized | 390,000 |
Company shares given to employees, shares | 66,828 | 20,938
Company shares given to employees, value | 797,000 | 176,000
Maximum disposal restricted percentage of RSU | 50.00% |
Stock options grant to each non-employee director | 56,800 |
Non-employee director is entitled to an annual cash retainer | 7,000 |
Non-employee director received restricted stock award value | 20,000 |
Options granted weighted average fair value per share | $ 2.79 | $ 2.02
Aggregate intrinsic value of options exercised | 706,000 | 241,000
Reservation of shares under Stock Purchase Plan | 247,500 |
Employee Stock Purchase Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Employee Stock Purchase Plan discount rate | 15.00% |
Compensation expense | 100,000 | 100,000
Non-Employee Director [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares granted to non director employee directors | 20,000 | 20,000
Non-employee director is entitled to an annual cash retainer additional | 500 |
Stock Option [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting period | 4 years |
Unrecognized compensation expense related to unvested options | 250,000 |
Expenses to be recognized over a weighted average period | 2 years |
Aggregate intrinsic value of option exercised | 2,905,000 |
Aggregate intrinsic value of the options outstanding | 3,707,000 |
Weighted average remaining contractual terms for these options that are exercisable | 3 years 7 months 6 days |
Weighted average remaining contractual terms for these options outstanding | 4 years 8 months 12 days |
Equity Incentive Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Aggregate shares authorized for awards under the plan | 1,000,000 |
Shares available for grant under the plan | 359,475 |
Equity Incentive Plan [Member] | Non-Employee Director [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Option expiration period | 10 years |
Stock options grant to each non-employee director | 5,000 |
2013 Restricted Stock Units (RSUs) [Member] | First Anniversary [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted stock unit vested percentage | 50.00% |
2013 Restricted Stock Units (RSUs) [Member] | Second Anniversary [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted stock unit vested percentage | 50.00% |
2014 Restricted Stock Units (RSUs) [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation expense related to unvested RSUs and RSAs | $ 375,000 |
2014 Restricted Stock Units (RSUs) [Member] | Officer [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Cumulative budgeted net sales target measurement period | 2014 through 2016 |
2014 Restricted Stock Units (RSUs) [Member] | Officer [Member] | Net Sales Target [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted stock unit vested percentage | 50.00% |
2014 Restricted Stock Units (RSUs) [Member] | Officer [Member] | ORONA Target [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted stock unit vested percentage | 25.00% |
2014 Restricted Stock Units (RSUs) [Member] | Officer [Member] | Third Anniversary [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted stock unit vested percentage | 25.00% |
Restricted Stock [Member] | Non-Employee Director [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting period | 12 months |

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