Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Schedule of Stockholders' Equity Note, Warrants or Rights (Details)

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Stockholders' Equity - Schedule of Stockholders' Equity Note, Warrants or Rights (Details)
 3 Months Ended
Jul. 31, 2016
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Number of Warrants  
Warrants outstanding, beginning of period | shares 207,625
Warrants, issued | shares 0
Warrants, expired | shares (73,958)
Warrants outstanding, end of period | shares 133,667
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Grant Date Fair Value  
Warrants, weighted average exercise price outstanding, beginning of period | $ / shares $ 19.74
Warrants, weighted average exercise price, issued | $ / shares 0
Warrants, weighted average exercise price, expired | $ / shares 40.68
Warrants, weighted average exercise price outstanding, end of period | $ / shares $ 8.15
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures  
Warrants, weighted average remaining contractual term, beginning of period 1 year 3 months
Warrants, weighted average remaining contractual term, end of period 2 years 4 months
Warrants, aggregate intrinsic value, outstanding, beginning of period | $ $ 0 [1]
Warrants, aggregate intrinsic value, issued | $ 0 [1]
Warrants, aggregate intrinsic value, outstanding, end of period | $ $ 0 [1]
[1] This amount represents the difference between the conversion price and $1.80, the closing price of Dataram common stock on July 29, 2016 as reported on the NASDAQ Stock Market, for all in-the-money warrants outstanding.