Annual report pursuant to Section 13 and 15(d)

Severance and Other Restructuring Costs (Details Textual)

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Severance and Other Restructuring Costs (Details Textual) (USD $)
 12 Months Ended 1 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2013
NH Building [Member]
Jan. 31, 2013
Employee Severance [Member]
Jan. 31, 2013
Finance and Manufacturing Head Counts [Member]
Jan. 31, 2013
Leasehold Improvements [Member]
May 31, 2012
Restructuring Charges [Member]
May 31, 2012
Chief Executive Officer [Member]
Severance Costs $ 1,900,000 $ 200,000         $ 2,500,000  
Leasehold Improvement Charge 800,000              
Non Recurring Expenses               200,000
Severance and Restructuring Charges 3,100,000     0 0 800,000    
Bid Price 700,000              
Reduced Sale Price 500,000              
Restructuring Costs $ 1,200,000 $ 3,600,000 $ 1,100,000