Document and Entity Information - shares	3 Months Ended
	Sep. 30, 2021	Nov. 11, 2021
Cover [Abstract]
Document Type	10-Q
Entity Central Index Key	0000033533
Document Period End Date	Sep. 30, 2021
Current Fiscal Year End Date	--06-30
Document Fiscal Year Focus	2021
Document Quarterly Report	true
Document Transition Report	false
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity File Number	1-4383
Entity Registrant Name	ESPEY MFG. & ELECTRONICS CORP.
Entity Incorportion, State or Country Code	NY
Entity Tax Identification Number	14-1387171
Entity Address, Address Line One	233 Ballston Avenue, Saratoga Springs
Entity Address, Address Line Two	New York 12866
Entity Address, City or Town	NY
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	12866
City Area Code	518
Local Phone Number	245-4400
Title of 12(b) Security	Common stock, $.33-1/3 par value
Trading Symbol	ESP
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		2,702,633