Deferred and restricted stock (Details) (USD $)	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Restricted stock [Line Items]
Deferred Compensation Arrangement with Individual, Common Stock Reserved for Future Issuance	9,991
Restricted stock grants	12,000	52,000
Restricted stock granted, weighted average fair value		$ 11.24
Restricted stock issued	(8,000)	21,000
Restricted stock forfeited	0	(2,000)
Restricted stock, forfeitures, weighted average fair value		$ 11.25
Deferred shares outstanding	33,396	28,891	0
share based compensation, other than options, weighted average, outstanding	$ 10.00	$ 14.52	$ 0.00
Restricted stock, aggregate intrinsic value	$ 334,000	$ 419,000	$ 0
unrecognized restricted stock expense	800,000
cost is expected to be recognized over the weighted-average period	2 years 4 months 24 days
Director [Member]
Restricted stock [Line Items]
Deferred shares granted value	30,000
Restricted Stock [Member]
Restricted stock [Line Items]
vesting period restricted stock	3 years
unrecognized restricted stock expense	$ 200,000
cost is expected to be recognized over the weighted-average period	1 year 7 months 24 days