Property, Plant and Equipment (Details) (USD $)	3 Months Ended
Aug. 31, 2012	Aug. 31, 2011
Depreciation expense	$ 161,054	$ 161,333

Amount of total depreciation expense for property, plant and equipment. Includes production and non-production related depreciation.

No definition available.

Name:	us-gaap_DepreciationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration