Asset Retirement Obligations (Tables)

12 Months Ended

Mar. 31, 2013

Asset Retirement Obligation Disclosure [Abstract]

Rollforward of the asset retirement obligations

	2013	2012
Carrying amount of asset retirement obligations as of April 1	$     663,279	$     578,911
Liabilities incurred	114,003	53,468
Liabilities settled	(3,246)	(5,351)
Accretion expense	39,376	36,251
Carrying amount of asset retirement obligations as of March 31	813,412	663,279
Less: Current portion	50,000	50,000
Non-Current asset retirement obligation	$   763,412	$   613,279