Note 6 - Property And Equipment (Details) - Property And Equipment (USD $) In Thousands, unless otherwise specified	May 31, 2013	May 31, 2012
Property, Plant and Equipment [Line Items]
Property and Equipment	$ 107,314	$ 76,381
Less accumulated depreciation	(30,933)	(11,719)
Property and equipment, net	76,381	64,662
Land [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment	301	301
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment	2,575	2,304
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment	20,629	11,994
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment	5,047	4,545
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment	3,282	1,966
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment	$ 75,480	$ 55,271