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Note 3 - Accrued Liabilities (Details) - Accrued Liabilities (USD $)
Dec. 31, 2014
Dec. 31, 2013
Note 3 - Accrued Liabilities (Details) - Accrued Liabilities [Line Items]    
Reserve for uncertain tax positions $ 810,000us-gaap_LiabilityForUncertainTaxPositionsCurrent $ 885,000us-gaap_LiabilityForUncertainTaxPositionsCurrent
Deferred lease obligations 276,000us-gaap_DeferredRentCreditCurrent  
Property taxes 83,000us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent 59,000us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent
Legal 74,000us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent 47,000us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent
Warranty reserve 27,000us-gaap_ProductWarrantyAccrualClassifiedCurrent 20,000us-gaap_ProductWarrantyAccrualClassifiedCurrent
Inventory receipts 1,000inph_GoodsReceivedInvoiceNotReceived 174,000inph_GoodsReceivedInvoiceNotReceived
Accrued other 110,000us-gaap_OtherAccruedLiabilitiesCurrent 148,000us-gaap_OtherAccruedLiabilitiesCurrent
Total accrued liabilites 1,540,000us-gaap_AccruedLiabilitiesCurrent 1,513,000us-gaap_AccruedLiabilitiesCurrent
Ministry of the Economy, Finance and Industry, France [Member]    
Note 3 - Accrued Liabilities (Details) - Accrued Liabilities [Line Items]    
Reserve for uncertain tax positions 810,000us-gaap_LiabilityForUncertainTaxPositionsCurrent
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_MinistryOfTheEconomyFinanceAndIndustryFranceMember		 885,000us-gaap_LiabilityForUncertainTaxPositionsCurrent
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_MinistryOfTheEconomyFinanceAndIndustryFranceMember
French litigation payroll taxes $ 159,000us-gaap_AccruedPayrollTaxesCurrent
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_MinistryOfTheEconomyFinanceAndIndustryFranceMember		 $ 180,000us-gaap_AccruedPayrollTaxesCurrent
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_MinistryOfTheEconomyFinanceAndIndustryFranceMember