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Stockholders’ Deficiency (Details Narrative 2) (USD $)
9 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 34 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Mar. 27, 2014
Jun. 17, 2013
Jun. 17, 2016
Jul. 31, 2014
Jan. 14, 2014
Net proceeds from financing    $ 2,770,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock              
Shares of common stock 806,477us-gaap_CommonStockValue             778,512us-gaap_CommonStockValue  
Accounts payable and accrued expenses 7,622,479us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent             8,034,122us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent  
Series E Convertible Preferred Stock                  
Convertible preferred stock, shares authorized 2,450us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
            2,450us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
 
Convertible preferred stock, cumulative percentage of interest 9.00%GNBT_ConvertiblePreferredStockPercentageOfInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
            9.00%GNBT_ConvertiblePreferredStockPercentageOfInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
 
Convertible preferred stock, par value (in dollars per share) $ 1,000us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
            $ 1,000us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
 
Convertible preferred stock, shares issued 25us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
            25us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
 
Common stock issued upon conversion of preferred stock 66,666,666us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
               
Common stock issued as "make-whole payments" on conversions of preferred stock 18,585,193us-gaap_SharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
               
Convertible preferred stock conversion price     $ 0.03GNBT_ConvertiblePreferredStockConversionPrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
           
Net proceeds from financing 750,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
               
Conversion of preferred stock 2,025us-gaap_ConversionOfStockAmountIssued1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
               
Conversion of stock, amount converted 2,000us-gaap_ConversionOfStockAmountConverted1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
               
Warrants issued to investors     40,833,335GNBT_WarrantsIssuedToInvestors
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
           
Initial "Make-whole payments" 216,000GNBT_InitialMakewholePayments
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
               
"Make-whole payments", value 6,750GNBT_MakewholePaymentsValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
               
Series F Convertible Preferred Stock                  
Convertible preferred stock, shares authorized 4,150us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
      4,150us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
    4,150us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
 
Convertible preferred stock, cumulative percentage of interest 9.00%GNBT_ConvertiblePreferredStockPercentageOfInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
      9.00%GNBT_ConvertiblePreferredStockPercentageOfInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
    9.00%GNBT_ConvertiblePreferredStockPercentageOfInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
 
Convertible preferred stock, par value (in dollars per share) $ 1,000us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
      $ 1,000us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
    $ 1,000us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
 
Convertible preferred stock, shares issued 838us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
      2,075us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
    1,225us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
 
Common stock issued upon conversion of preferred stock 41,224,999us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
      69,166,667us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
       
Common stock issued as "make-whole payments" on conversions of preferred stock 13,048,644us-gaap_SharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
               
Convertible preferred stock conversion price         $ 0.03GNBT_ConvertiblePreferredStockConversionPrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
       
Net proceeds from financing 2,020,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
      2,020,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
       
Preferred stock, dividend rate percentage       3.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
         
Conversion of stock, amount converted 1,237us-gaap_ConversionOfStockAmountConverted1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
               
Warrants issued to investors       69,166,667GNBT_WarrantsIssuedToInvestors
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
         
Aggregate subscription amount, maximum         2,075,000us-gaap_TemporaryEquitySharesSubscribedButUnissuedSubscriptionsReceivable
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
       
Initial "Make-whole payments" 560,250GNBT_InitialMakewholePayments
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
               
"Make-whole payments", value 233,078GNBT_MakewholePaymentsValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
               
Series E Convertible Preferred Stock                  
Convertible preferred stock, shares authorized           2,450us-gaap_PreferredStockSharesAuthorized
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= us-gaap_SeriesEPreferredStockMember
     
Convertible preferred stock, cumulative percentage of interest           9.00%GNBT_ConvertiblePreferredStockPercentageOfInterest
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= us-gaap_SeriesEPreferredStockMember
     
Convertible preferred stock, par value (in dollars per share)           $ 1,000us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= us-gaap_SeriesEPreferredStockMember
     
Convertible preferred stock, shares issued           1,225us-gaap_PreferredStockSharesIssued
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= us-gaap_SeriesEPreferredStockMember
     
Common shares attributable to conversion of preferred stock           40,833,335us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= us-gaap_SeriesEPreferredStockMember
     
Convertible preferred stock conversion price             $ 0.03GNBT_ConvertiblePreferredStockConversionPrice
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= us-gaap_SeriesEPreferredStockMember
   
Net proceeds from financing           1,165,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= us-gaap_SeriesEPreferredStockMember
     
Common stock, effective conversion price             $ 0.03GNBT_CommonStockEffectiveConversionPrice
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= us-gaap_SeriesEPreferredStockMember
   
Preferred stock, dividend rate percentage             9.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= us-gaap_SeriesEPreferredStockMember
   
Conversion of preferred stock           800us-gaap_ConversionOfStockAmountIssued1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= us-gaap_SeriesEPreferredStockMember
270us-gaap_ConversionOfStockAmountIssued1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= us-gaap_SeriesEPreferredStockMember
   
Conversion of stock, amount converted             1,000us-gaap_ConversionOfStockAmountConverted1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= us-gaap_SeriesEPreferredStockMember
   
Warrants issued to investors           26,666,668GNBT_WarrantsIssuedToInvestors
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= us-gaap_SeriesEPreferredStockMember
     
Aggregate subscription amount, maximum           $ 1,225,000us-gaap_TemporaryEquitySharesSubscribedButUnissuedSubscriptionsReceivable
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= us-gaap_SeriesEPreferredStockMember
     
Series E Convertible Preferred Stock                  
Convertible preferred stock, cumulative percentage of interest                 9.00%GNBT_ConvertiblePreferredStockPercentageOfInterest
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_SeriesEPreferredStockMember
Convertible preferred shares sold                 800GNBT_ConvertiblePreferredSharesSold
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_SeriesEPreferredStockMember