Accrued Expenses and Other Liabilities (Details) (USD $)	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Environmental liability (see Note 13)	$ 404,000	$ 788,000
Contract costs provision	278,000	0
Contract loss provision	71,000	1,086,000
Warranty liability	167,000	226,000	144,000
Other	411,000	398,000
Accrued expenses and other liabilities	$ 1,331,000	$ 2,498,000