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Quarterly Results (Unaudited) (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 22, 2017 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ 24,622,000 |  | $ 68,794,000 |  | $ 72,636,000 |  | $ 23,235,000 |  | $ 23,441,000 |  | $ 67,795,000 |  | $ 61,354,000 |  | $ 20,827,000 |  | $ 189,287,000 | $ 173,417,000 | $ 168,595,000
Gross profit |  | 5,894,000 |  | 24,467,000 |  | 26,683,000 |  | 8,427,000 |  | 6,431,000 |  | 24,311,000 |  | 23,738,000 |  | 8,063,000 |  | 65,471,000 | 62,543,000 | 59,610,000
Net (loss) income |  | $ (8,550,000) |  | $ 2,524,000 |  | $ 5,028,000 |  | $ (2,211,000) |  | $ (4,985,000) |  | $ 23,998,000 |  | $ 6,885,000 |  | $ (3,138,000) |  | $ (3,209,000) | $ 22,760,000 | $ 4,549,000
Per common share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (dollar per share) |  | $ (0.56) | [1] | $ 0.16 | [1] | $ 0.33 | [1] | $ (0.15) | [1] | $ (0.33) | [1] | $ 1.59 | [1] | $ 0.46 | [1] | $ (0.21) | [1] | $ (0.21) | $ 1.51 | $ 0.31
Assuming dilution (dollar per share) |  | $ (0.56) | [1] | $ 0.16 | [1] | $ 0.33 | [1] | $ (0.15) | [1] | $ (0.33) | [1] | $ 1.57 | [1] | $ 0.45 | [1] | $ (0.21) | [1] | $ (0.21) | $ 1.49 | $ 0.30
Valuation allowance |  | $ 925,000 |  |  |  |  |  |  |  | $ 515,000 |  | $ 17,962,000 |  |  |  |  |  | $ 925,000 | $ 515,000 |
TCJA, Change in tax rate, income tax expense (benefit) | $ 4,438,000 | $ 4,438,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Net loss per share was calculated based on basic shares outstanding due to the anti-dilutive effect on the inclusion of common stock equivalent shares.

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