Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2021	Mar. 30, 2022	Jun. 30, 2021
Document Information Line Items
Entity Registrant Name	TRANS-LUX CORPORATION
Document Type	10-K
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		13,446,276
Entity Public Float			$ 758,000
Amendment Flag	false
Entity Central Index Key	0000099106
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, 2021
Document Fiscal Year Focus	2021
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	1-2257
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	13-1394750
Entity Address, Address Line One	254 West 31st Street
Entity Address, Address Line Two	12th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10001
City Area Code	800
Local Phone Number	243-5544
Entity Interactive Data Current	Yes
Title of 12(g) Security	Common Stock, par value $0.001 per share
Auditor Name	Marcum llp
Auditor Firm ID	688
Auditor Location	New Haven, CT