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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.