Document and Entity Information - shares	6 Months Ended
	Mar. 31, 2019	May 01, 2019
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	Mar. 31, 2019
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Entity Filer Category	Non-accelerated Filer
Entity Small Business Flag	true
Entity Emerging Growth Company	false
Entity Ex Transition Period	false
Entity Common Stock, Shares Outstanding		2,579,238
Trading Symbol	MFCO
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2019