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Note 1 - Summary of Significant Accounting Policies (Details) (USD $)
 0 Months Ended 12 Months Ended 3 Months Ended
Aug. 13, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]          
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax   $ (203,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax      
Proceeds from Issuance of Private Placement 3,300,000us-gaap_ProceedsFromIssuanceOfPrivatePlacement 3,349,000us-gaap_ProceedsFromIssuanceOfPrivatePlacement      
Available-for-sale Securities   3,579,000us-gaap_AvailableForSaleSecurities 5,121,000us-gaap_AvailableForSaleSecurities   3,579,000us-gaap_AvailableForSaleSecurities
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value     4,600,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue    
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value     500,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue    
Sales Returns and Allowances, Goods   19,000us-gaap_SalesReturnsAndAllowancesGoods 28,000us-gaap_SalesReturnsAndAllowancesGoods 22,000us-gaap_SalesReturnsAndAllowancesGoods  
Inventory Write-down   1,072,000us-gaap_InventoryWriteDown 120,000us-gaap_InventoryWriteDown 57,000us-gaap_InventoryWriteDown  
Impairment of Long-Lived Assets Held-for-use   0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse  
Unbilled Receivables, Current   2,000us-gaap_UnbilledReceivablesCurrent 46,000us-gaap_UnbilledReceivablesCurrent   2,000us-gaap_UnbilledReceivablesCurrent
Standard Product Warranty Accrual   27,000us-gaap_StandardProductWarrantyAccrual 20,000us-gaap_StandardProductWarrantyAccrual   27,000us-gaap_StandardProductWarrantyAccrual
Investment Income, Interest   7,000us-gaap_InvestmentIncomeInterest 12,000us-gaap_InvestmentIncomeInterest 34,000us-gaap_InvestmentIncomeInterest  
Interest Expense   4,000us-gaap_InterestExpense 5,000us-gaap_InterestExpense 9,000us-gaap_InterestExpense  
Advertising Expense   22,000us-gaap_AdvertisingExpense 1,000us-gaap_AdvertisingExpense 9,000us-gaap_AdvertisingExpense  
Adjustments, Prior Period [Member]          
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]          
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax         $ (189,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
/ us-gaap_StatementScenarioAxis
= inph_AdjustmentsPriorPeriodMember
Computer Software, Intangible Asset [Member] | Minimum [Member]          
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]          
Property, Plant and Equipment, Useful Life   3 years      
Computer Software, Intangible Asset [Member] | Maximum [Member]          
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]          
Property, Plant and Equipment, Useful Life   5 years