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Note 8 - Segment Information - Revenue by Product Line (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenues $ 2,079us-gaap_Revenues $ 3,433us-gaap_Revenues
Telecommunications [Member]    
Revenues 1,491us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= inph_TelecommunicationsMember		 1,735us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= inph_TelecommunicationsMember
Services [Member]    
Revenues 500us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= inph_ServicesMember		 1,647us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= inph_ServicesMember
Other Products [Member]    
Revenues $ 88us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= inph_OtherProductsMember		 $ 51us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= inph_OtherProductsMember