Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2015	Jul. 24, 2015
Entity Registrant Name	INTERPHASE CORP
Entity Central Index Key	0000728249
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding (in shares)		8,393,981
Document Type	10-Q
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2
Amendment Flag	false