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Note 3 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Note 3 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value [Line Items]  
Preferred stock warrant liabilities $ 624vivmf_PreferredStockWarrantLiabilities
Total liabilities 624us-gaap_LiabilitiesFairValueDisclosure
Fair Value, Inputs, Level 3 [Member]  
Note 3 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value [Line Items]  
Preferred stock warrant liabilities 624vivmf_PreferredStockWarrantLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Total liabilities $ 624us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member