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Note 8 - Stock-based Compensation (Details) - Stock Options Exercised (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Stock Options Exercised [Abstract]    
Proceeds from stock options exercised   $ 343us-gaap_ProceedsFromStockOptionsExercised
Fair value of shares received upon exercised of stock options 20us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised 478us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Tax benefit related to stock options exercised 1us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions 69us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
Intrinsic value of stock options exercised $ 2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 212us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue