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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Credit losses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Reserve for gaming and non-gaming receivables	$ 0.2	$ 0.1

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

X

- References

No definition available.

+ Details

Name:	us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration