Consolidated Statements of Cash Flows (Parenthetical) (USD $)	12 Months Ended
	May 31, 2012	May 31, 2011
Supplemental Information (Note 11)
Preferred stock dividend accrual	$ 242,192	$ 0
Equipment acquired by issuance of capital lease	563,026	0
Advance due to related party applied against related receivable	625,180	0
Interest paic	$ 516,059	$ 722,855