Document And Entity Information	9 Months Ended
Sep. 30, 2011	Oct. 27, 2011 Capital Stock [Member]	Oct. 27, 2011 Class B Capital Stock [Member]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2011
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2011
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		2,553,878	1,465,290

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