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Accounting Policies (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2013 | Jul. 31, 2012 | Jul. 31, 2013 | Jul. 31, 2012 | Jan. 31, 2013
Accounting Policies (Details) [Line Items] |  |  |  |  |
Interest Paid | $ 941,000 | $ 1,152,000 | $ 1,922,000 | $ 2,735,000 |
Derivative Settlement on Interest Rate Swap | 422,000 | 446,000 | 862,000 | 929,000 |
Income Taxes Paid |  |  | 0 | 51,000 |
Proceeds from Income Tax Refunds |  |  | 0 | 0 |
Unrecognized Tax Benefit | 1,768,000 |  | 1,768,000 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 421,000 |  | 421,000 |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 82,000 |  | 82,000 |  |
Inventory Write-down |  |  | 233,000 |  | 466,000
Property, Plant and Equipment, Depreciation Methods |  |  | Depreciation is computed using the straight-line method |  |
Impairment of Real Estate |  |  | $ 0 | $ 100,000 |
Estimated Cash Flow Percentage |  |  | 25.00% |  |
Estimated Future Cash Flows Terms |  |  | six |  |
Plant Operation Suspension |  |  | 6 months |  |
Number of Majority Owned Subsidiaries |  |  | 2 |  |
Maximum Percentage of Equity Ownership Interest Which May be Considered for Equity Method of Accounting |  |  | 20.00% |  |
Building and Building Improvements [Member] | Minimum [Member] |  |  |  |  |
Accounting Policies (Details) [Line Items] |  |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives |  |  | 15 |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |  |  |
Accounting Policies (Details) [Line Items] |  |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives |  |  | 40 |  |
Fixtures And Equipment [Member] | Minimum [Member] |  |  |  |  |
Accounting Policies (Details) [Line Items] |  |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives |  |  | 3 |  |
Fixtures And Equipment [Member] | Maximum [Member] |  |  |  |  |
Accounting Policies (Details) [Line Items] |  |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives |  |  | 20 |  |
Minimum [Member] |  |  |  |  |
Accounting Policies (Details) [Line Items] |  |  |  |  |
Extended Period of Warranty |  |  | 12 months |  |
Maximum [Member] |  |  |  |  |
Accounting Policies (Details) [Line Items] |  |  |  |  |
Extended Period of Warranty |  |  | 60 months |  |

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