Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details Textual)

v2.4.0.6
Summary of Significant Accounting Policies (Details Textual) (USD $)
12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Jan. 31, 2010
Allowance for doubtful accounts receivable (in dollars) $ 813,000 $ 972,000 $ 995,000 $ 852,000
Inventory write-down 1,752,000 430,000 2,474,000  
Cost Method Investment Ownership Percentage 20.00%      
Cost of Goods Sold, Amortization 2,400,000 2,500,000 2,000,000  
Minimum Threshold Tax Position likelihood of occurrence greater than 50%      
Foreign Currency Transaction Gain (Loss), Realized 23,000 200,000 1,200,000  
New Accounting Pronouncement or Change in Accounting Principle, Current Period Disclosures, Revenue Recognized, Amount 0      
Advertising Expense 200,000 400,000 300,000  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 0      
Investments 5,600,000      
Foreign Currency Transaction Loss, before Tax 800,000 1,000,000    
Deferred Tax Assets Valuation Allowance Percentage 100.00%      
Comprehensive (loss) income (9,389,000) (4,970,000) 28,351,000  
Restructuring Charges [Member]
       
Inventory write-down   400,000 2,500,000  
Cost Of Sales [Member]
       
Inventory write-down $ 1,800,000      
Outstanding Stock Awards [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 495,185 1,004,158    
Stock Options [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 1,649,210 1,566,726 2,459,389  
Minimum [Member]
       
Equity Method Investment, Ownership Percentage 20.00%      
Maximum [Member]
       
Equity Method Investment, Ownership Percentage 50.00%      
Accounts Receivable [Member]
       
Concentration Risk, Percentage 19.00% 11.00%    
Sales Revenue, Segment [Member]
       
Concentration Risk, Percentage 30.00% 35.00%