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Note 5 - Derivative Instruments (Details) - Summary of Cash Flow Hedges (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2013	Aug. 31, 2012
Summary of Cash Flow Hedges [Abstract]
Beginning balance	$ (1,551)	$ 590
Changes in fair value	(4,296)	(3,172)
Realized loss reclassified to earnings	1,000	1,031
Ending balance	$ (4,847)	$ (1,551)

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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