Note 9 - Long-Term Debt (Details) (USD $)	3 Months Ended		9 Months Ended			9 Months Ended								3 Months Ended	9 Months Ended	1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 28, 2013	Aug. 31, 2012	May 31, 2013	Feb. 28, 2013	Feb. 28, 2014	Feb. 28, 2014 Per Quarter [Member] Term Loan [Member]	Feb. 28, 2014 Federal Funds Effective Rate [Member]	Feb. 28, 2014 London Interbank Offered Rate (LIBOR) [Member] Revolving Credit Facility [Member]	Feb. 28, 2014 London Interbank Offered Rate (LIBOR) [Member] Term Loan [Member]	Feb. 28, 2014 London Interbank Offered Rate (LIBOR) [Member]	Feb. 28, 2014 Base Rate [Member] Revolving Credit Facility [Member]	Feb. 28, 2014 Base Rate [Member] Term Loan [Member]	Feb. 28, 2014 Notes Payable, Other Payables [Member]	Aug. 31, 2012 Revolving Credit Facility [Member]	Feb. 28, 2014 Revolving Credit Facility [Member]	Sep. 30, 2013 Term Loan [Member]	Feb. 28, 2013 Term Loan [Member]	Aug. 31, 2012 Term Loan [Member]	Feb. 28, 2014 Term Loan [Member]	May 31, 2013 Term Loan [Member]	Feb. 28, 2014 Letter of Credit [Member]	Feb. 28, 2014 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 Decrease														1.25%			0.75%	1.50%
Gains (Losses) on Extinguishment of Debt (in Dollars)	(2,425,000)	(6,700,000)	(5,625,000)	(9,111,000)
Proceeds from Lines of Credit (in Dollars)				47,000,000													6,000,000
Debt Instrument, Basis Spread on Variable Rate							0.50%	3.75%	3.75%	1.00%	2.75%	2.75%
Line of Credit Facility, Interest Rate at Period End																						1.25%
Line of Credit Facility Step Down Rate															0.25%
Debt Instrument, Interest Rate, Stated Percentage													11.125%						5.00%	5.00%
Line of Credit Facility, Amount Outstanding (in Dollars)															0						0
Line of Credit Facility Principal Payment Percentage																			0.25%
Debt Instrument, Periodic Payment, Principal (in Dollars)						1,700,000
Repayments of Lines of Credit (in Dollars)				26,000,000												2,000,000
Debt Instrument, Face Amount (in Dollars)													$ 400,000,000