Inventories (Details 1) (USD $)	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Beginning balance	$ 2,219,000	$ 2,424,000
Amounts written off	(289,000)	(315,000)
Amounts charged to operations	142,000	110,000
Ending balance	$ 2,072,000	$ 2,219,000