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LEGAL MATTERS (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Legal matters |  |  |  |
Professional service fees relating to our construction litigation | $ 0.5 | $ 0.2 | $ 0.8 | $ 0.2
PCL Construction Services, Inc. |  |  |  |
Legal matters |  |  |  |
Professional service fees relating to our construction litigation | $ 0.5 |  | $ 0.8 |

X
- Definition Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_LitigationCaseAxis=mcri_PclConstructionServicesInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |