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Note 3 - Investments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Note 3 - Investments (Details) [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 22us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1  
Minority Interest in Early Stage Private Company [Member] | Maximum [Member]    
Note 3 - Investments (Details) [Line Items]    
Noncontrolling Interest, Ownership Percentage by Parent   10.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ invest_InvestmentAxis
= iphi_MinorityInterestInEarlyStagePrivateCompanyMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Minority Interest in Early Stage Private Company [Member]    
Note 3 - Investments (Details) [Line Items]    
Cost Method Investments, Original Cost $ 5,000us-gaap_CostMethodInvestmentsOriginalCost
/ invest_InvestmentAxis
= iphi_MinorityInterestInEarlyStagePrivateCompanyMember		 $ 2,621us-gaap_CostMethodInvestmentsOriginalCost
/ invest_InvestmentAxis
= iphi_MinorityInterestInEarlyStagePrivateCompanyMember