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Note 4 - Fair Value Measures (Tables)

3 Months Ended

Nov. 30, 2014

Disclosure Text Block [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

		Fair Value Measurements at Reporting Date Using
November 30, 2014		Level 1				Level 2				Level 3				Total
Assets
Corporate money market funds ⁽¹⁾		$	74,138			$	0			$	0			$	74,138
Certificates of deposit ⁽²⁾			0				24,727				0				24,727
Derivative instruments ⁽³⁾			0				1,213				0				1,213
Total assets measured at fair value		$	74,138			$	25,940			$	0			$	100,078

Liabilities
Derivative instruments ⁽³⁾		$	0			$	577			$	0			$	577
Total liabilities measured at fair value		$	0			$	577			$	0			$	577

		Fair Value Measurements at Reporting Date Using
August 31, 2014		Level 1				Level 2				Level 3				Total
Assets
Corporate money market funds ⁽¹⁾		$	75,363			$	0			$	0			$	75,363
Certificates of deposit ⁽²⁾			0				20,008				0				20,008
Derivative instruments ⁽³⁾			0				1,406				0				1,406
Total assets measured at fair value		$	75,363			$	21,414			$	0			$	96,777

Liabilities
Derivative instruments ⁽³⁾		$	0			$	591			$	0			$	591
Total liabilities measured at fair value		$	0			$	591			$	0			$	591