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Revolving Line Of Credit - Additional Information (Details) - USD ($)
 9 Months Ended
Oct. 31, 2015
Jan. 31, 2015
Wells Fargo Senior Secured Revolving Credit Facility    
Line Of Credit Facility [Line Items]    
Line of credit facility, maximum borrowing capacity $ 135,000,000  
Line of credit facility, amount outstanding 57,001,000 $ 47,886,000
Amounts in depository under lock-box arrangements $ 7,325,000 $ 5,987,000
Revolving credit facility, covenant term The Revolving Line of Credit also requires us to maintain a minimum availability at all times of not less than 10% of the gross borrowing base, and in any event, not less than $5,000  
Line of credit , maturity date Dec. 03, 2019  
Wells Fargo Senior Secured Revolving Credit Facility | Minimum    
Line Of Credit Facility [Line Items]    
Line of credit facility available borrowing capacity $ 5,000,000  
Wells Fargo Stand-by Commercial Letters of Credit    
Line Of Credit Facility [Line Items]    
Net borrowing available under revolving line of credit $ 750,000