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Summary of Significant Accounting Policies (Details) (USD $) | 12 Months Ended
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Jan. 31, 2013 | Jan. 31, 2012
Summary of Significant Accounting Policies (Textual) [Abstract] |  |
Highly liquid investments with an original maturity | 90 days or less |
Cash of held in foreign bank accounts | $ 1,157,000 | $ 1,929,000
Depreciation expense | 1,331,000 | 1,576,000
Net foreign exchange losses | 158,000 | 27,000
Advertising expense | 750,000 | 970,000
Total reimbursement | 313,000 | 487,000
Estimated outstanding reimbursements | 100,000 | 150,000
Number of common equivalent shares | 583,512 | 664,690
Net unrealized gains on available for sale securities | 7,000 |
Net translation gains on foreign operations | 166,000 |
Compensation expenses is recognized for option forfeited | 0 |
Land improvements [Member] | Maximum [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Estimated useful lives of the assets | 20 years |
Land improvements [Member] | Minimum [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Estimated useful lives of the assets | 10 years |
Buildings and improvements [Member] | Maximum [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Estimated useful lives of the assets | 45 years |
Buildings and improvements [Member] | Minimum [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Estimated useful lives of the assets | 10 years |
Machinery and equipment [Member] | Maximum [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Estimated useful lives of the assets | 10 years |
Machinery and equipment [Member] | Minimum [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Estimated useful lives of the assets | 3 years |
Grass Technologies Product Group [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Gain on sale of assets of discontinued operations | $ 779,000 |

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