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Note 7 - Derivative Instruments and Hedging Activities (Details) (Forward Contracts [Member], USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Note 7 - Derivative Instruments and Hedging Activities (Details) [Line Items]    
Derivative, Notional Amount $ 26,200,000invest_DerivativeNotionalAmount $ 26,500,000invest_DerivativeNotionalAmount
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments (300,000)us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments 100,000us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments
Designated as Hedging Instrument [Member]
   
Note 7 - Derivative Instruments and Hedging Activities (Details) [Line Items]    
Derivative, Notional Amount 22,300,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
20,600,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Not Designated as Hedging Instrument [Member]
   
Note 7 - Derivative Instruments and Hedging Activities (Details) [Line Items]    
Derivative, Loss on Derivative $ 50,000us-gaap_DerivativeLossOnDerivative
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
$ 500,000us-gaap_DerivativeLossOnDerivative
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember