| Cover | Oct. 25, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 25, 2021 |
| Entity File Number | 0-22088 |
| Entity Registrant Name | Monarch Casino & Resort, Inc. |
| Entity Central Index Key | 0000907242 |
| Entity Tax Identification Number | 88-0300760 |
| Entity Incorporation, State or Country Code | NV |
| Entity Address, Address Line One | 3800 South Virginia Street |
| Entity Address, City or Town | Reno |
| Entity Address, State or Province | NV |
| Entity Address, Postal Zip Code | 89502 |
| City Area Code | 775 |
| Local Phone Number | 335-4600 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.01 per value per share |
| Trading Symbol | MCRI |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
