Summary of Business and Significant Accounting Policies (Property, Plant, and Equipment) (Details) - USD ($)	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018
Property, Plant and Equipment [Line Items]
Repair and maintenance	$ 2,145,000	$ 1,518,000
Depreciation and amortization expense	5,791,000	5,466,000
Rental income	40,000	$ 40,000
Property, Plant And Equipment Included in AP And Accrued Expense	$ 593,000
Land Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Land Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	25 years
Buildings and building improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Buildings and building improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	40 years
Machinery and equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Machinery and equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	10 years