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Valuation and Qualifying Accounts (Tables)
12 Months Ended
Jan. 31, 2013
Valuation and Qualifying Accounts [Abstract]  
Valuation Allowance
    2013     2012  
Allowance for doubtful accounts:            
             
Balance - beginning of year   $ 42,576     $ 34,746  
                 
Charged to operations     74,393       118,077  
                 
Write-off of accounts receivable     (38,147 )     (110,247 )
                 
Balance - end of year   $ 78,822     $ 42,576