Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Stock-Based Compensation - Summary of option activity (Details)

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Summary of Significant Accounting Policies - Stock-Based Compensation - Summary of option activity (Details) (USD $)
3 Months Ended 12 Months Ended
Jul. 31, 2009
Apr. 30, 2013
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Apr. 30, 2012
Summary of option activity, Shares      
Beginning Balance (in shares)   290,983  
Granted 8,333 41,667  
Exercised       
Expired   (21,075)  
Ending balance (in shares)   311,575  
Exercisable April 30, 2013   257,325  
Expected to vest April 30, 2013   272,000  
Summary of option activity, Weighted average exercise price      
Beginning balance (in dollars per share)   $ 14.04  
Granted   $ 3.12  
Exercised       
Expired   $ 16.65  
Ending balance (in dollars per share)   $ 12.40  
Exercisable April 30, 2013   $ 14.10  
Expected to vest April 30, 2013   $ 12.40  
Summary of option activity, Additional disclosures      
Balance April 30, 2012, Weighted average remaining contractual life   5 years 0 months 7 days 5 years 3 months 15 days [1]
Balance April 30, 2013, Weighted average remaining contractual life   5 years 0 months 7 days 5 years 3 months 15 days [1]
Exercisable April 30, 2013, Weighted average remaining contractual life   4 years 7 months 28 days  
Expected to vest April 30, 2013, Weighted average remaining contractual life   5 years 0 months 7 days  
Balance April 30, 2012, Aggregate intrinsic value      [2]  
Granted, Aggregate intrinsic value       
Exercised, Aggregate intrinsic value       
Expired, Aggregate intrinsic value       
Balance April 30, 2013, Aggregate intrinsic value       
Exercisable April 30, 2013, Aggregate intrinsic value       
Expected to vest April 30, 2013, Aggregate intrinsic value       
Summary of Significant Accounting Policies (Textual) [Abstract]      
Closing price of common stock on NASDAQ Stock Market   $ 2.09  
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.