Document And Entity Information	6 Months Ended
	Jun. 30, 2013	Jul. 29, 2013 Capital Stock [Member]	Jul. 29, 2013 Class B Capital Stock [Member]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2013
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2013
Entity Registrant Name	MONARCH CEMENT CO
Entity Central Index Key	0000067517
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		2,586,721	1,411,299
Trading Symbol	mcem