Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Nov. 05, 2020
Document Information Line Items
Entity Registrant Name	TRANS LUX Corp
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		13,474,116
Amendment Flag	false
Entity Central Index Key	0000099106
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Document Period End Date	Sep. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Interactive Data Current	Yes