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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) (USD $)
3 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jul. 01, 2014
Jan. 01, 2014
Jul. 31, 2014
Apr. 26, 2012
Summary of significant accounting policies                              
Amount of goodwill recorded $ 25,111,000us-gaap_Goodwill       $ 25,111,000us-gaap_Goodwill       $ 25,111,000us-gaap_Goodwill $ 25,111,000us-gaap_Goodwill          
Net book value 180,271,000us-gaap_PropertyPlantAndEquipmentNet       175,637,000us-gaap_PropertyPlantAndEquipmentNet       180,271,000us-gaap_PropertyPlantAndEquipmentNet 175,637,000us-gaap_PropertyPlantAndEquipmentNet          
Net Income (Loss) Available to Common Stockholders, Basic 3,811,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 4,074,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 3,024,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 3,276,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 2,059,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 5,520,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 6,120,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 4,262,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 14,185,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 17,961,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 8,911,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic        
Monarch Black Hawk                              
Summary of significant accounting policies                              
Amount of goodwill recorded 25,100,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= mcri_RivieraBlackHawkIncMember
              25,100,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= mcri_RivieraBlackHawkIncMember
          25,110,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= mcri_RivieraBlackHawkIncMember
Monarch Black Hawk Parking Structure                              
Summary of significant accounting policies                              
Net book value         4,800,000us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_BusinessAcquisitionAxis
= mcri_MonarchBlackHawkParkingStructureMember
        4,800,000us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_BusinessAcquisitionAxis
= mcri_MonarchBlackHawkParkingStructureMember
      2,900,000us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_BusinessAcquisitionAxis
= mcri_MonarchBlackHawkParkingStructureMember
 
Estimated depreciable life                   P37Y   P18M P15M    
Depreciation, Per Month                   300,000mcri_DepreciationPerMonth
/ us-gaap_BusinessAcquisitionAxis
= mcri_MonarchBlackHawkParkingStructureMember
      200,000mcri_DepreciationPerMonth
/ us-gaap_BusinessAcquisitionAxis
= mcri_MonarchBlackHawkParkingStructureMember
 
Depreciation, Net of Tax, Per Month                   200,000mcri_DepreciationNetOfTaxPerMonth
/ us-gaap_BusinessAcquisitionAxis
= mcri_MonarchBlackHawkParkingStructureMember
      100,000mcri_DepreciationNetOfTaxPerMonth
/ us-gaap_BusinessAcquisitionAxis
= mcri_MonarchBlackHawkParkingStructureMember
 
Depreciation                 2,900,000us-gaap_Depreciation
/ us-gaap_BusinessAcquisitionAxis
= mcri_MonarchBlackHawkParkingStructureMember
           
Net Income (Loss) Available to Common Stockholders, Basic                 $ 1,900,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_BusinessAcquisitionAxis
= mcri_MonarchBlackHawkParkingStructureMember
           
Basic and diluted earnings per share (in dollars per share)                 $ 0.11us-gaap_EarningsPerShareBasicAndDiluted
/ us-gaap_BusinessAcquisitionAxis
= mcri_MonarchBlackHawkParkingStructureMember