Asset Retirement Obligations (Details 1) - USD ($)	3 Months Ended		12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Apr. 30, 2015	Apr. 30, 2014
Asset Retirement Obligation Disclosure [Abstract]
2016	$ 541,958		$ 541,959
2017	$ 212,000
2018
2019
2020
Thereafter	$ 391,032
Total, before discount	1,144,990		1,143,857
Effect of discount	(10,056)	$ (12,642)	(216,504)
Asset Retirement Obligations	$ 928,486		$ 918,430	$ 818,010