Stock-based compensation Restricted stock (Details) (USD $)	9 Months Ended
	Oct. 31, 2014	Jan. 31, 2014
Outstanding	33,000	29,000
weighted average, outstanding	$ 9.12	$ 14.52
Aggregate Intrinsic Value, Outstanding	$ 305,000	$ 419,000
Granted	84,000
Weighted Average Grant Date Fair Value	$ 12.41
Issued	(80,000)
Director [Member]
Restricted stock granted	$ 30,000
Deferred shares issued	(7,580)