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Note 8 - Derivative Financial Instruments (Details Textual) (USD $)
Nov. 30, 2014
May 25, 2014
May 30, 2010
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Derivative Asset, Notional Amount     $ 20,000,000us-gaap_DerivativeAssetNotionalAmount
Derivative Liability, Fair Value, Gross Liability 9,000us-gaap_DerivativeFairValueOfDerivativeLiability 44,000us-gaap_DerivativeFairValueOfDerivativeLiability  
Derivative, Swaption Interest Rate     4.24%us-gaap_DerivativeSwaptionInterestRate
Derivative, Notional Amount     $ 20,000,000invest_DerivativeNotionalAmount