Document and Entity Information - shares	3 Months Ended
	Dec. 31, 2017	Feb. 01, 2018
Document And Entity Information
Entity Registrant Name	MICROWAVE FILTER CO INC /NY/
Entity Central Index Key	0000716688
Document Type	10-Q
Document Period End Date	Dec. 31, 2017
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		2,579,684
Trading Symbol	MFCO
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2018