Note 19 - Income Taxes (Details) - Geographic Breakdown of (Loss) Income Before Income Taxes - USD ($) $ in Thousands	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Note 19 - Income Taxes (Details) - Geographic Breakdown of (Loss) Income Before Income Taxes [Line Items]
(Loss) income before income taxes	$ (45,125)	$ (198,173)	$ (63,708)
UNITED STATES
Note 19 - Income Taxes (Details) - Geographic Breakdown of (Loss) Income Before Income Taxes [Line Items]
(Loss) income before income taxes	(57,043)	(210,354)	(74,451)
Foreign Countries [Member]
Note 19 - Income Taxes (Details) - Geographic Breakdown of (Loss) Income Before Income Taxes [Line Items]
(Loss) income before income taxes	$ 11,918	$ 12,181	$ 10,743