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Note 4 - Credit Facility (Details) (Revolving Credit Facility [Member], USD $)
3 Months Ended 12 Months Ended
Mar. 26, 2015
Dec. 31, 2014
Dec. 31, 2013
Note 4 - Credit Facility (Details) [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)   5,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity  
Long-term Line of Credit (in Dollars)   3,500,000us-gaap_LineOfCredit 3,500,000us-gaap_LineOfCredit
Line of Credit Facility, Interest Rate at Period End   1.70%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd 1.70%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Subsequent Event [Member] | Liquidation of Marketable Securities [Member]      
Note 4 - Credit Facility (Details) [Line Items]      
Repayments of Long-term Lines of Credit (in Dollars) 3,400,000us-gaap_RepaymentsOfLongTermLinesOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_ExtinguishmentOfDebtAxis
= inph_LiquidationOfMarketableSecuritiesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Subsequent Event [Member] | Extinguished from Cash Account [Member]      
Note 4 - Credit Facility (Details) [Line Items]      
Repayments of Long-term Lines of Credit (in Dollars) $ 100,000us-gaap_RepaymentsOfLongTermLinesOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_ExtinguishmentOfDebtAxis
= inph_ExtinguishedFromCashAccountMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
     
Note 4 - Credit Facility (Details) [Line Items]      
Debt Instrument, Basis Spread on Variable Rate   1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
 
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
     
Note 4 - Credit Facility (Details) [Line Items]      
Debt Instrument, Basis Spread on Variable Rate   1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
 
Minimum [Member]
     
Note 4 - Credit Facility (Details) [Line Items]      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.25%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Maximum [Member]
     
Note 4 - Credit Facility (Details) [Line Items]      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.75%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember