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Note 7 - Customer and Geographic Information (Details)
3 Months Ended
Mar. 31, 2015
Note 7 - Customer and Geographic Information (Details) [Line Items]  
Number of Operating Segments 1us-gaap_NumberOfOperatingSegments
Customer Concentration Risk [Member]  
Note 7 - Customer and Geographic Information (Details) [Line Items]  
Concentration Risk, Percentage 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
Accounts Receivable [Member]  
Note 7 - Customer and Geographic Information (Details) [Line Items]  
Concentration Risk, Percentage 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember