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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Credit losses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Reserve for gaming and non-gaming receivables | $ 0.1 | $ 0.2

X
- Definition Amount of reserve for gaming and non-gaming receivables. + References No definition available. + Details
Name: | mcri_ReserveForGamingAndNonGamingReceivables
Namespace Prefix: | mcri_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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