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