Document and Entity Information - shares	9 Months Ended
	Mar. 31, 2021	May 13, 2021
Document And Entity Information [Abstract]
Entity Registrant Name	ESPEY MFG & ELECTRONICS CORP
Entity Central Index Key	0000033533
Document Type	10-Q
Document Period End Date	Mar. 31, 2021
Amendment Flag	false
Current Fiscal Year End Date	--06-30
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2021
Entity Common Stock, Shares Outstanding		2,702,633
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity File Number	1-4383
Entity Incorportion, State or Country Code	NY
Entity Shell Company	false