Document And Entity Information - shares	9 Months Ended
	Jun. 30, 2018	Aug. 10, 2018
Document Information [Line Items]
Entity Registrant Name	TECHNICAL COMMUNICATIONS CORP
Entity Central Index Key	0000096699
Trading Symbol	tcco
Current Fiscal Year End Date	--09-29
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)		1,849,025
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Amendment Flag	false