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Note 4 - Derivative Instruments and Hedging Activities (Details) - Outstanding Foreign Currency Contracts (Foreign Exchange Contract [Member]) In Thousands, unless otherwise specified	Dec. 31, 2014 United Kingdom, Pounds GBP (£)	Dec. 31, 2013 United Kingdom, Pounds GBP (£)	Dec. 31, 2013 United States of America, Dollars USD ($)
Note 4 - Derivative Instruments and Hedging Activities (Details) - Outstanding Foreign Currency Contracts [Line Items]
British Pound Sterling (GBP) to Euro	£ 5,000invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_GBP / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember	£ 4,000invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_GBP / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember	$ 650invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_USD / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember
United States Dollar (USD) to Euro (in Dollars)	£ 5,000invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_GBP / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember	£ 4,000invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_GBP / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember	$ 650invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_USD / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember

X

- Details

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X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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