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Note 11 - Other Financial Information (Details)
 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 36 Months Ended 24 Months Ended
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 30, 2013
USD ($)
Jun. 30, 2013
USD ($)
Mar. 31, 2013
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2013
Other Loss [Member]
Non-competition Indemnity [Member]
Ministry of the Economy, Finance and Industry, France [Member]
USD ($)
Mar. 31, 2013
Other Loss [Member]
Non-competition Indemnity [Member]
Ministry of the Economy, Finance and Industry, France [Member]
USD ($)
Dec. 31, 2014
Nokia Solutions and Networks [Member]
Sales Revenue, Net [Member]
Customer Concentration Risk [Member]
Dec. 31, 2013
Nokia Solutions and Networks [Member]
Sales Revenue, Net [Member]
Customer Concentration Risk [Member]
Dec. 31, 2012
Nokia Solutions and Networks [Member]
Sales Revenue, Net [Member]
Customer Concentration Risk [Member]
Dec. 31, 2014
Nokia Solutions and Networks [Member]
USD ($)
Dec. 31, 2013
Nokia Solutions and Networks [Member]
USD ($)
Dec. 31, 2012
Nokia Solutions and Networks [Member]
USD ($)
Dec. 31, 2014
E4D Technologies LLC [Member]
Sales Revenue, Net [Member]
Customer Concentration Risk [Member]
Dec. 31, 2014
E4D Technologies LLC [Member]
USD ($)
Dec. 31, 2013
E4D Technologies LLC [Member]
USD ($)
Dec. 31, 2014
Alcatel Lucent [Member]
Sales Revenue, Net [Member]
Customer Concentration Risk [Member]
Dec. 31, 2013
Alcatel Lucent [Member]
Sales Revenue, Net [Member]
Customer Concentration Risk [Member]
Dec. 31, 2012
Alcatel Lucent [Member]
Sales Revenue, Net [Member]
Customer Concentration Risk [Member]
Dec. 31, 2014
Alcatel Lucent [Member]
USD ($)
Dec. 31, 2013
Alcatel Lucent [Member]
USD ($)
Dec. 31, 2012
Alcatel Lucent [Member]
USD ($)
Dec. 31, 2014
Sanmina-SCI Corporation [Member]
USD ($)
Dec. 31, 2014
Unicom Engineering, Inc. [Member]
USD ($)
Dec. 31, 2014
Hewlett Packard [Member]
USD ($)
Dec. 31, 2014
Non-competition Indemnity [Member]
USD ($)
Dec. 31, 2014
Non-competition Indemnity [Member]
EUR (€)
Mar. 31, 2013
Non-competition Indemnity [Member]
USD ($)
Mar. 31, 2013
Non-competition Indemnity [Member]
EUR (€)
Dec. 31, 2014
Pending Litigation [Member]
USD ($)
Dec. 31, 2014
Pending Litigation [Member]
EUR (€)
Dec. 31, 2014
Sales Revenue, Net [Member]
Customer Concentration Risk [Member]
Dec. 31, 2014
Accounts Receivable [Member]
Customer Concentration Risk [Member]
Note 11 - Other Financial Information (Details) [Line Items]                                                                              
Revenues $ 2,870,000us-gaap_Revenues $ 4,212,000us-gaap_Revenues $ 3,262,000us-gaap_Revenues $ 3,433,000us-gaap_Revenues $ 4,322,000us-gaap_Revenues $ 4,168,000us-gaap_Revenues $ 3,818,000us-gaap_Revenues $ 3,280,000us-gaap_Revenues $ 13,777,000us-gaap_Revenues $ 15,588,000us-gaap_Revenues $ 13,855,000us-gaap_Revenues           $ 3,300,000us-gaap_Revenues
/ us-gaap_MajorCustomersAxis
= inph_NokiaSolutionsAndNetworksMember		 $ 3,500,000us-gaap_Revenues
/ us-gaap_MajorCustomersAxis
= inph_NokiaSolutionsAndNetworksMember		 $ 1,900,000us-gaap_Revenues
/ us-gaap_MajorCustomersAxis
= inph_NokiaSolutionsAndNetworksMember		   $ 2,300,000us-gaap_Revenues
/ us-gaap_MajorCustomersAxis
= inph_E4DTechnologiesLLCMember		         $ 1,400,000us-gaap_Revenues
/ us-gaap_MajorCustomersAxis
= inph_AlcatelLucentMember		 $ 3,300,000us-gaap_Revenues
/ us-gaap_MajorCustomersAxis
= inph_AlcatelLucentMember		 $ 3,800,000us-gaap_Revenues
/ us-gaap_MajorCustomersAxis
= inph_AlcatelLucentMember		                      
Concentration Risk, Percentage                           24.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= inph_NokiaSolutionsAndNetworksMember		 23.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= inph_NokiaSolutionsAndNetworksMember		 13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= inph_NokiaSolutionsAndNetworksMember		       17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= inph_E4DTechnologiesLLCMember		     10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= inph_AlcatelLucentMember		 21.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= inph_AlcatelLucentMember		 27.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= inph_AlcatelLucentMember		                            
Concentration Risk, Threshold, Percentage                                                                           10.00%inph_ConcentrationRiskThresholdPercentage
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember		 10.00%inph_ConcentrationRiskThresholdPercentage
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
Receivables from Customers                                 760,000us-gaap_ReceivablesFromCustomers
/ us-gaap_MajorCustomersAxis
= inph_NokiaSolutionsAndNetworksMember		 404,000us-gaap_ReceivablesFromCustomers
/ us-gaap_MajorCustomersAxis
= inph_NokiaSolutionsAndNetworksMember		       491,000us-gaap_ReceivablesFromCustomers
/ us-gaap_MajorCustomersAxis
= inph_E4DTechnologiesLLCMember		         809,000us-gaap_ReceivablesFromCustomers
/ us-gaap_MajorCustomersAxis
= inph_AlcatelLucentMember		   266,000us-gaap_ReceivablesFromCustomers
/ us-gaap_MajorCustomersAxis
= inph_SanminaSCICorporationMember		 251,000us-gaap_ReceivablesFromCustomers
/ us-gaap_MajorCustomersAxis
= inph_UnicomEngineeringIncMember		 199,000us-gaap_ReceivablesFromCustomers
/ us-gaap_MajorCustomersAxis
= inph_HewlettPackardMember		                
Purchase Obligation 50,000us-gaap_PurchaseObligation               50,000us-gaap_PurchaseObligation                                                            
Loss Contingency, Damages Sought, Value                                                               7,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LitigationCaseAxis
= inph_NonCompetitionIndemnityMember		 5,700us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LitigationCaseAxis
= inph_NonCompetitionIndemnityMember		     175,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember		 144,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember		    
Estimated Litigation Liability                       $ 115,000us-gaap_LitigationReserve
/ us-gaap_IncomeStatementLocationAxis
= inph_OtherLossMember
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_MinistryOfTheEconomyFinanceAndIndustryFranceMember
/ us-gaap_LitigationCaseAxis
= inph_NonCompetitionIndemnityMember		 $ 340,000us-gaap_LitigationReserve
/ us-gaap_IncomeStatementLocationAxis
= inph_OtherLossMember
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_MinistryOfTheEconomyFinanceAndIndustryFranceMember
/ us-gaap_LitigationCaseAxis
= inph_NonCompetitionIndemnityMember		                                         $ 340,000us-gaap_LitigationReserve
/ us-gaap_LitigationCaseAxis
= inph_NonCompetitionIndemnityMember		 € 265,000us-gaap_LitigationReserve
/ us-gaap_LitigationCaseAxis
= inph_NonCompetitionIndemnityMember