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Schedule II - Valuation And Qualifying Accounts (Detail) - Valuation and Qualifying Accounts (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | |
|---|---|---|
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Jan. 31, 2013
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Jan. 31, 2012
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Allowance for Doubtful Accounts [Member]
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| Balance at the beginning of year | $ 87 | $ 119 |
| Charged to cost and expense (recovery) | (38) | (29) |
| Deductions | (25) | (3) |
| Other changes add (deduct) | 0 | 0 |
| Balance at end of year | 24 | 87 |
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Valuation Allowance of Deferred Tax Assets [Member]
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| Balance at the beginning of year | 17,130 | 15,121 |
| Charged to cost and expense (recovery) | 0 | 0 |
| Deductions | 0 | 0 |
| Other changes add (deduct) | 619 | 2,009 |
| Balance at end of year | 17,749 | 17,130 |
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Inventory Valuation Reserve [Member]
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| Balance at the beginning of year | 1,792 | 1,581 |
| Charged to cost and expense (recovery) | 0 | 357 |
| Deductions | 0 | (146) |
| Other changes add (deduct) | (1,161) | 0 |
| Balance at end of year | $ 631 | $ 1,792 |