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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) (USD $)
Apr. 30, 2014
Jan. 31, 2014
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 8,377,000 $ 8,390,000
Less - accumulated depreciation 4,270,000 4,207,000
Property, plant and equipment, net 4,107,000 4,183,000
Land and Improvements [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 473,000 473,000
Building and Improvements [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 2,782,000 2,779,000
Furniture, Machinery and Equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 3,575,000 3,560,000
Trucks and Other Vehicles [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,547,000 $ 1,578,000