Document and Entity Information - shares	6 Months Ended
	Dec. 31, 2019	Feb. 12, 2020
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	Dec. 31, 2019
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	Q2
Document Fiscal Year Focus	2020
Entity Common Stock, Shares Outstanding		2,401,033
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