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Related Interest Expense (Detail) (USD $)
3 Months Ended 12 Months Ended
Jan. 31, 2013
Oct. 31, 2012
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2013
Jan. 31, 2012
Senior Secured Note [Line Items]                    
Interest expense $ 259,995 $ 221,239 $ 224,906 $ 224,036 $ 154,060 $ 68,047 $ 40,978 $ 40,949 $ 930,176 $ 304,034
Senior secured note | SpaGus
                   
Senior Secured Note [Line Items]                    
Interest expense                 $ 73,337 $ 0