Note 5 - Derivative Instruments (Details) - Fair Value Amounts of Derivative Instruments and Gains (USD $) In Thousands, unless otherwise specified	Nov. 30, 2014	Aug. 31, 2014
Derivatives designated as hedging instruments Assets: Foreign Currency Forward Contracts
Derivatives Assets designated as hedging instruments	$ 1,213	$ 1,406
Liabilities: Foreign Currency Forward Contracts
Accounts payable and accrued expenses	713	626
Prepaid Expenses and Other Current Assets [Member]
Derivatives designated as hedging instruments Assets: Foreign Currency Forward Contracts
Derivatives Assets designated as hedging instruments	0	114
Other Assets [Member]
Derivatives designated as hedging instruments Assets: Foreign Currency Forward Contracts
Derivatives Assets designated as hedging instruments	1,213	1,292
Accounts Payable and Accrued Liabilities [Member]
Liabilities: Foreign Currency Forward Contracts
Accounts payable and accrued expenses	$ 577	$ 591