Note 8 - Property, Plant and Equipment (Details) (USD $)	3 Months Ended	6 Months Ended
Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 2013
Depreciation expense attributable to continuing operations	$ 131,391us-gaap_Depreciation	$ 120,709us-gaap_Depreciation	$ 257,974us-gaap_Depreciation	$ 239,598us-gaap_Depreciation
Depreciation expense	131,391us-gaap_Depreciation	120,709us-gaap_Depreciation	257,974us-gaap_Depreciation	239,598us-gaap_Depreciation
Discontinued Operations
Depreciation expense attributable to continuing operations			3,689	97,317
Depreciation expense			$ 3,689	$ 97,317

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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