Note 5 - Property And Equipment (Details) - Property And Equipment (USD $) In Thousands, unless otherwise specified	Nov. 30, 2013	May 31, 2013
Property, Plant and Equipment [Line Items]
Property and Equipment	$ 115,929	$ 107,314
Less accumulated depreciation	(39,695)	(30,933)
Property and equipment, net	76,234	76,381
Land [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment	297	301
Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment	2,578	2,575
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment	20,723	20,629
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment	6,820	5,047
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment	3,409	3,282
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment	$ 82,102	$ 75,480