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Summary of Significant Accounting Policies - Summary of option activity (Details) (USD $)
 9 Months Ended
Jan. 31, 2013
integer
Apr. 30, 2012
Summary of option activity, Shares    
Balance April 30, 2012 290,983  
Granted 16,667  
Exercised     
Expired (21,075)  
Balance January 31, 2013 286,575  
Exercisable January 31, 2013 257,325  
Expected to vest January 31, 2013 272,167  
Summary of option activity, Weighted average exercise price    
Balance April 30, 2012 $ 14.04  
Granted $ 4.14  
Exercised $ 0  
Expired $ 16.65  
Balance January 31, 2013 $ 13.27  
Exercisable January 31, 2013 $ 14.10  
Expected to vest January 31, 2013 $ 13.27  
Summary of option activity, Additional disclosures    
Balance April 30, 2012, Weighted average remaining contractual life 4 years 10 months 3 days [1] 5 years 3 months 15 days [1]
Balance January 31, 2013, Weighted average remaining contractual life 4 years 10 months 3 days [1] 5 years 3 months 15 days [1]
Exercisable January 31, 2013, Weighted average remaining contractual life 4 years 10 months 28 days [1]  
Expected to vest January 31, 2013, Weighted average remaining contractual life 4 years 10 months 3 days  
Balance April 30, 2012, Aggregate intrinsic value    [2]  
Granted, Aggregate intrinsic value    [2]  
Exercised, Aggregate intrinsic value    [2]  
Expired, Aggregate intrinsic value    [2]  
Balance January 31, 2013, Aggregate intrinsic value    [2]  
Exercisable January 31, 2013, Aggregate intrinsic value    [2]  
Expected to vest January 31, 2013, Aggregate intrinsic value    [2]  
Summary of Significant Accounting Policies (Textual) [Abstract]    
Closing price of common stock on NASDAQ Stock Market $ 2.52  
Number of in-the-money options 0  
[1] This amount represents the weighted average remaining contractual life of stock options in years.
[2] This amount represents the difference between the exercise price and $2.52, the closing price of Dataram common stock on January 31, 2013 as reported on the NASDAQ Stock Market, adjusted for a 1 for 6 reverse stock split, for all in-the-money options outstanding and all the in-the-money shares exercisable. There were no in-the-money options at January 31, 2013.