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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentrations of Credit Risk and Credit Losses (Details) $ in Millions | Sep. 30, 2022 USD ($)
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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |
Gaming and non-gaming receivables | $ 0.2

X
- Definition Represents gaming and non-gaming receivables. + References No definition available. + Details
Name: | mcri_GamingAndNonGamingReceivables
Namespace Prefix: | mcri_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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