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Note 5 - Property And Equipment (Detail) (USD $)	3 Months Ended			6 Months Ended	9 Months Ended	3 Months Ended
Note 5 - Property And Equipment (Detail) (USD $)	Feb. 28, 2013	Feb. 29, 2012	Aug. 19, 2011	Feb. 29, 2012	Feb. 28, 2013	Nov. 30, 2012 Construction in Progress [Member]
Depreciation	$ 5,300,000	$ 4,500,000	$ 3,400,000	$ 9,700,000	$ 15,400,000
Gain (Loss) on Sale of Property Plant Equipment					$ (1,175,000)	$ 1,200,000

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.

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