Stockholders' Equity (Tables)

3 Months Ended

Jul. 31, 2013

Stockholders' Equity Note [Abstract]

Schedule of Fair Value Assumptions of Options and Warrants

The fair value of each option and warrant grant or modification during the three months ended July 31, 2013 and 2012 was determined using the Black-Scholes option pricing model and the following assumptions:

	Three Months Ended July 31,
	2013	2012
Risk free interest rate	0.11% - 0.15%	0.15 - 0.74%
Expected life	0.09-1.64	0.01 - 5 years
Annualized volatility	191.11% - 299.98%	204.98% - 377.83%
Expected dividends	-	-

Schedule of Stock Options Activity

A summary of REGI’s stock option activity for the three months ended July 31, 2013 is as follows:

	July 31, 2013
			Weighted
			Average
			Exercise
	Options		Price
Outstanding at beginning of period	2,638,000	$	0.15
Outstanding at end of period	2,638,000	$	0.15
Exercisable at end of period	659,500	$	0.15
Weighted average fair value of options granted		$	0.17

Summary of Common Stock Warrants Activity

A summary of REGI’s common stock warrant activity for three months ended July 31, 2013 is as follows:

	July 31, 2013
			Weighted
			Average
			Exercise
	Warrants		Price
Outstanding at beginning of period	3,730,150	$	0.18
Outstanding at end of period	3,730,150	$	0.18
Exercisable at end of period	3,692,650	$	0.18