Note 9 - Long-Term Debt (Details) (USD $)	3 Months Ended					3 Months Ended							1 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Jun. 30, 2012	Aug. 19, 2011	Feb. 28, 2013 Decrease [Member] Term Loan [Member]	Aug. 31, 2013 Base Rate Borrowing [Member] Revolving Facility [Member]	Aug. 31, 2013 LIBOR Rate [Member] Revolving Facility [Member]	Aug. 31, 2013 Federal Funds Effective Rate [Member]	Aug. 31, 2013 LIBOR Rate [Member]	Aug. 19, 2011 Revolving Credit Facility [Member]	Aug. 31, 2012 Senior Credit Facilities [Member]	May 31, 2012 Senior Credit Facilities [Member]	Feb. 28, 2013 Term Loan [Member]	Aug. 31, 2013 Minimum [Member]
Note 9 - Long-Term Debt (Details) [Line Items]
Secured Long-term Debt, Noncurrent (in Dollars)				$ 663,400,000
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)										100,000,000
Letters of Credit Outstanding, Amount (in Dollars)										25,000,000
Debt Instrument, Interest Rate, Stated Percentage					0.75%						5.75%	7.25%
Gains (Losses) on Extinguishment of Debt (in Dollars)		(6,686,000)
Proceeds from Lines of Credit (in Dollars)		24,000,000											6,000,000
Debt Instrument, Basis Spread on Variable Rate								0.50%	1.00%
Line of Credit Facility, Interest Rate at Period End														1.25%
Line of Credit Facility, Interest Rate Description	The applicable margin for borrowings under the Revolving Facility is subject to a 0.25% step-down, when the Company's senior secured net leverage ratio at the end of a fiscal quarter is less than or equal to 3:00 to 1:00.					2.75%	3.75%	2.75%	3.75%
Debt Instrument, Periodic Payment (in Dollars)			$ 0.0025