Discontinued operations (Details) (USD $)	3 Months Ended		6 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012
Discontinued operations
Net proceeds from sale of discontinued operations			$ 15,253,000	$ 0
Proceeds held in escrow			1,100,000
escrow released date			May 01, 2014
Sales included in discontinued operations	811,000	9,380,000	10,419,000	18,486,000
Gain on disposal of discontinued operations	96,000	0	11,665,000	0
Income from discontinued operations	(94,000)	(135,000)	(326,000)	(58,000)
Income from discontinued operations before income taxes	2,000	(135,000)	11,339,000	(58,000)
Income tax expense from discontinued operations	42,000	(15,000)	2,398,000	(6,000)
(Loss) income from discontinued operations, net of tax	$ (40,000)	$ (120,000)	$ 8,941,000	$ (52,000)
Disposal Date			Jun. 26, 2013