DOCUMENT AND ENTITY INFORMATION	9 Months Ended
Sep. 30, 2011	Nov. 09, 2011
Entity Registrant Name	BLONDER TONGUE LABORATORIES INC
Entity Central Index Key	0001000683
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Trading Symbol	bdr
Entity Common Stock, Shares Outstanding		6,212,223
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2011
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2011

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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