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Document And Entity Information (USD $)
12 Months Ended
Dec. 31, 2013
Jun. 30, 2013
Feb. 14, 2014
Capital Stock [Member]
Feb. 14, 2014
Class B Capital Stock [Member]
Document Type 10-K      
Amendment Flag false      
Document Period End Date Dec. 31, 2013      
Document Fiscal Period Focus FY      
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     2,600,232 1,366,699
Trading Symbol mcem      
Entity Voluntary Filers No      
Entity Well-known Seasoned Issuer No      
Entity Current Reporting Status Yes      
Entity Public Float   $ 75,325,827