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Note 11 - Stock-based Compensation (Details) - Stock Option Activity for Employees and Non-employees (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Stock Option Activity for Employees and Non-employees [Abstract]    
Options 1,235,526us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 607,017us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Weighted-Average Exercise Price $ 4.19us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 2.22us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Weighted-Average Remaining Contractual Term (years) 7 years 36 days 5 years 73 days
Aggregate Intrinsic Value $ 7,709us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue $ 1,627us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Granted 659,865us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod  
Granted $ 5.94us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice  
Exercised (31,356)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised  
Exercised $ 1.89us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice  
Exercisable at December 31, 2014 572,184us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber  
Exercisable at December 31, 2014 $ 2.36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice  
Exercisable at December 31, 2014 4 years 6 months  
Exercisable at December 31, 2014 4,615us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1  
Vested or expected to vest at December 31, 2014 (1) 1,163,249us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber [1]  
Vested or expected to vest at December 31, 2014 (1) $ 4.13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice [1]  
Vested or expected to vest at December 31, 2014 (1) 7 years [1]  
Vested or expected to vest at December 31, 2014 (1) $ 7,327us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue [1]  
[1] Represents the number of vested options at December 31, 2014 plus the number of unvested options expected to vest based on the unvested options outstanding at December 31, 2014.