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Note 2 - Acquisition (Details) - Significant Assumptions Underlying the Valuation of IPR&D (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Significant Assumptions Underlying the Valuation of IPR&D [Abstract]    
Estimated percent complete   5.00%iphi_BusinessCombinationResearchAndDevelopmentInProcessEstimatedPercentComplete
Estimated time to complete 18 months  
Estimated cost to complete (in Dollars)   $ 12,548iphi_BusinessCombinationResearchAndDevelopmentInProcessEstimatedCostToComplete
Discount rate   26.50%iphi_BusinessCombinationResearchAndDevelopmentInProcessDiscountRate