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, 2014 options		Apr. 30, 2013
Summary of option activity, Shares
Beginning Balance (in shares)		311,575
Granted	8,333
Exercised
Expired		(47,331)
Ending balance (in shares)		264,244		311,575
Exercisable April 30, 2014		251,744		257,325
Expected to vest April 30, 2014		250,000		272,000
Summary of option activity, Weighted average exercise price
Granted
Exercised
Expired		$ 12.26
Ending balance (in dollars per share)		$ 12.42
Exercisable April 30, 2014		$ 12.91		$ 14.10
Expected to vest April 30, 2014		$ 12.42		$ 12.40
Summary of option activity, Additional disclosures
Weighted average remaining contractual life		4 years 5 months 16 days		5 years 0 months 7 days
Exercisable, weighted average remaining contractual life		4 years 2 months 23 days
Expected to vest, weighted average remaining contractual life		4 years 5 months 16 days
Balance April 30, 2013, Aggregate intrinsic value
Granted, Aggregate intrinsic value
Exercised, Aggregate intrinsic value
Expired, Aggregate intrinsic value
Balance April 30, 2014, Aggregate intrinsic value		6,250	[1]
Exercisable April 30, 2014, Aggregate intrinsic value		3,125	[1]
Expected to vest April 30, 2014, Aggregate intrinsic value		$ 6,250	[1]
Summary of Significant Accounting Policies (Textual) [Abstract]
Closing price of common stock on NASDAQ Stock Market		$ 2.69
Number of in-the-money options outstanding		25,000

[1] These amounts represent the difference between the exercise price and the closing price of Dataram Common Stock as of the end of the reporting period, $2.69 on April 30, 2014 as reported on the NASDAQ Stock Market. There are 25,000 in-the-money options outstanding at April 30, 2014.