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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Mar. 05, 2016
Jun. 30, 2015
Document and Entity Information      
Entity Registrant Name MONARCH CASINO & RESORT INC    
Entity Central Index Key 0000907242    
Document Type 10-K/A    
Document Period End Date Dec. 31, 2015    
Amendment Flag true    
Amendment Description We are filing this amendment to our Form 10-K for the fiscal year ended December 31, 2015, filed with the Securities and Exchange Commission on March 11, 2016 (the "Original Filing"), solely to amend the cover page to correct (i) the number of shares of common stock outstanding as of March 5, 2016, and (ii) the aggregate market value of our common stock held by non-affiliates as of June 30, 2015. No other changes have been made to the Original Filing. This amendment does not modify, amend or update any of the financial or other information contained in the Original Filing, nor does it reflect events occurring after the filing of the Original Filing. This amendment consists solely of the amended cover page, this explanatory note, the signature page and the certifications and XBRL required to be filed as exhibits hereto.    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Entity Public Float     $ 257.9
Entity Common Stock, Shares Outstanding   17,216,952  
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY