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Discontinued operations (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2013 | Oct. 31, 2012 | Oct. 31, 2013 | Oct. 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 |
Disposal date HVAC subsidiary |  |  | Jun. 26, 2013 |
Net sales | 874,000 | 11,089,000 | 13,049,000 | 31,177,000
Gain on disposal of discontinued operations | 0 | 0 | 11,665,000 | 0
(Loss) income from discontinued operations | (211,000) | 415,000 | (288,000) | 891,000
(Loss) income from discontinued operations before income taxes | (211,000) | 415,000 | 11,377,000 | 891,000
Income tax (benefit) expense | (789,000) | 89,000 | 1,867,000 | 59,000
Income from discontinued operations, net of tax | $ 578,000 | $ 326,000 | $ 9,510,000 | $ 832,000

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