Stock options Options additional text (Details) (USD $)	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013
increase number of shares that may be issued	2.00%
Initial number of options to grant under plan	350,000
vesting period for stock options	P4Y
unrecognized stock option expense	$ 900,000
cost is expected to be recognized over the weighted-average period	2 years 4 months 24 days
Share-based Compensation	$ 196,000	$ 484,000
Maturity period for stock option fromI isuance date	10 years
Stock Option [Member]
Weighted average fair value of options granted	$ 4.78	$ 3.31