Document and Entity Information - USD ($)	12 Months Ended
	Jun. 30, 2021	Sep. 22, 2021	Dec. 31, 2020
Document And Entity Information
Document Type	10-K
Entity Central Index Key	0000033533
Current Fiscal Year End Date	--06-30
Document Fiscal Year Focus	2021
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Jun. 30, 2021
Document Fiscal Period Focus	FY
Entity File Number	1-4383
Entity Registrant Name	ESPEY MFG & ELECTRONICS CORP
Amendment Flag	false
Entity Incorporation, 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	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	12866
City Area Code	518
Local Phone Number	584-4100
Title of 12(b) Security	Common Stock $.33-1/3 par value
Trading Symbol	ESP
Name of Exchange on which Security is Registered	NYSE
Entity Well-Known Seasoned Issuer	No
Entity Voluntary Filers	No
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
Auditor Attestation Flag	false
Entity Public Float			$ 33,443,664
Entity Common stock, closing sale price			$ 18.92
Entity Common Stock, Shares Outstanding		2,702,633