Document and Entity Information - shares	6 Months Ended
	Dec. 31, 2017	Feb. 13, 2018
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, 2017
Amendment Flag	false
Current Fiscal Year End Date	--06-30
Entity Filer Category	Smaller Reporting Company
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2018
Entity Common Stock, Shares Outstanding		2,366,523