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Correction of immaterial errors (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended 60 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2012
Jul. 31, 2011
Jan. 31, 2012
Jan. 31, 2011
Inventories, net $ 40,710   $ 40,710   $ 40,204  
Total current assets 91,482   91,482   82,670  
Total assets 166,542   166,542   157,283  
Retained earnings 19,625   19,625   23,038  
Total stockholders' equity         72,355  
Total liabilities and stockholders' equity 166,542   166,542   157,283  
Cost of sales 42,355 53,206 85,955 98,365 197,175  
Gross profit 9,906 10,784 19,034 19,026 36,321  
Loss from operations         (5,063)  
Loss before income taxes (1,022) (160) (3,358) (2,274) (4,942)  
Net loss (1,357) (1,837) (3,413) (3,329) (4,959)  
Increase (Decrease) in Inventories     793 5,085 (4,621)  
Total comprehensive loss (2,200) (2,239) (4,264) (2,731) (6,732)  
Correction of prior year income         28 208
Previously reported [Member]
            
Inventories, net         39,968  
Total current assets         82,434  
Total assets         157,047  
Retained earnings         22,802  
Total stockholders' equity         72,119  
Total liabilities and stockholders' equity         157,047  
Cost of sales         197,203  
Gross profit         36,293  
Loss from operations         (5,091)  
Loss before income taxes         (4,970)  
Net loss         (4,987)  
Increase (Decrease) in Inventories         (4,593)  
Total comprehensive loss         (6,760)  
Adjustment [Member]
            
Inventories, net         236  
Total current assets         236  
Total assets         236  
Retained earnings         236  
Total stockholders' equity         236  
Total liabilities and stockholders' equity         236  
Cost of sales         (28)  
Gross profit         28  
Loss from operations         28  
Loss before income taxes         28  
Net loss         28  
Increase (Decrease) in Inventories         (28)  
Total comprehensive loss         $ 28