Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2022	Apr. 14, 2023	Jun. 30, 2022
Document Information Line Items
Entity Registrant Name	BLONDER TONGUE LABORATORIES, INC.
Trading Symbol	NONE
Document Type	10-K
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		13,368,538
Entity Public Float			$ 1,440,913
Amendment Flag	false
Entity Central Index Key	0001000683
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Well-known Seasoned Issuer	No
Document Period End Date	Dec. 31, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
ICFR Auditor Attestation Flag	false
Document Annual Report	true
Document Transition Report	false
Entity File Number	1-14120
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	52-1611421
Entity Address, Address Line One	One Jake Brown Road
Entity Address, City or Town	Old Bridge
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	08857
City Area Code	(732)
Local Phone Number	679-4000
Title of 12(b) Security	NONE
Security Exchange Name	NONE
Entity Interactive Data Current	Yes
Auditor Firm ID	688
Auditor Name	Marcum llp
Auditor Location	New York, NY