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REVENUE RECOGNITION - Casino Revenue (Details) - 12 months ended Dec. 31, 2019 | Total | USD ($)
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CONSOLIDATED STATEMENTS OF INCOME |  |
Number of components, progressive jackpot provisions | 2 | 2

X
- Definition The number of components for progressive jackpot provisions recognized. + References No definition available. + Details
Name: | mcri_NumberOfComponentsProgressiveJackpotProvisions
Namespace Prefix: | mcri_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_IncomeStatementAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration