Note 17 - Share-Based Compensation (Details) - Valuation Assumptions for Stock Options	12 Months Ended
	May 31, 2014		May 31, 2013		May 31, 2012
Valuation Assumptions for Stock Options [Abstract]
Risk-free interest rate (1)	0.42%	[1]	0.24%	[1]	0.24%	[1]
Expected volatility (2)	45.00%	[2]	50.00%	[2]	50.00%	[2]
Expected life (years) (3)	3 years 6 months	[3]	4 years 255 days	[3]	4 years 255 days	[3]
Expected dividend yield (4)	0.00%	[4]	0.00%	[4]	0.00%	[4]

[1] Based on the U.S. Constant Maturity Treasury (CMT) curve in effect at the time of award.

[2] Expected stock price volatility is based on the average historical volatility of the Company when it was publicly traded and weekly stock returns of comparable companies during the period corresponding to the expected life of the options and stock appreciation rights.

[3] Represents the period of time options are expected to remain outstanding.

[4] The Company has not paid dividends on its common stock and does not expect to pay dividends on its common stock in the near future.