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Note 4 - Fair Value Measures (Details) (USD $)	Feb. 28, 2015	Aug. 31, 2014
Note 4 - Fair Value Measures (Details) [Line Items]
Assets, Fair Value Disclosure	$ 107,127,000us-gaap_AssetsFairValueDisclosure	$ 96,777,000us-gaap_AssetsFairValueDisclosure
Financial and Nonfinancial Liabilities, Fair Value Disclosure	171,000us-gaap_LiabilitiesFairValueDisclosure	591,000us-gaap_LiabilitiesFairValueDisclosure
Long-term Debt	35,000,000us-gaap_LongTermDebt	0us-gaap_LongTermDebt
Long-term Debt, Fair Value	35,000,000us-gaap_LongTermDebtFairValue
Fair Value, Inputs, Level 3 [Member]
Note 4 - Fair Value Measures (Details) [Line Items]
Assets, Fair Value Disclosure	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 0	$ 0

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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