SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	9 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Sep. 30, 2018
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Basis of Presentation	Basis of Presentation: Monarch Casino & Resort, Inc. was incorporated in 1993. Unless otherwise indicated, “Monarch” and the “Company” refer to Monarch Casino & Resort, Inc. and its subsidiaries. Monarch owns and operates the Atlantis Casino Resort Spa, a hotel and casino in Reno, Nevada (the “Atlantis”) and Monarch Casino Black Hawk, a casino in Black Hawk, Colorado. In addition, Monarch owns separate parcels of land located next to the Atlantis and a parcel of land with an industrial warehouse located between Denver, Colorado and Monarch Casino Black Hawk. Monarch also owns Chicago Dogs Eatery, Inc. and Monarch Promotional Association, both of which were formed in relation to extended licensure requirements for extended hours of liquor operation in Black Hawk, Colorado. The accompanying unaudited condensed consolidated financial statements include the accounts of Monarch and its subsidiaries (the “Consolidated Financial Statements”). Intercompany balances and transactions are eliminated.
Interim Financial Statements	Interim Financial Statements: The Consolidated Financial Statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of the management of the Company, all adjustments considered necessary for a fair presentation are included. Operating results for the three and nine months ended September 30, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018. The balance sheet at December 31, 2017 has been derived from the audited consolidated financial statements of the Company at that date, but does not include all of the information and footnotes required by U.S. GAAP for complete financial statements. For further information, refer to the consolidated financial statements and footnotes thereto included in the Company’s annual report on Form 10-K for the year ended December 31, 2017.
Fair Value of Financial Instruments	Fair Value of Financial Instruments: The estimated fair value of the Company’s financial instruments has been determined by the Company, using available market information and valuation methodologies. However, considerable judgment is required to develop the estimates of fair value; thus, the estimates provided herein are not necessarily indicative of the amounts that the Company could realize in a current market exchange. The carrying amounts of cash, receivables, accounts payable and accrued expenses approximate fair value because of the short-term nature of these instruments. Additionally, the carrying value of our debt approximates fair value due to the variable nature of applicable interest rates and relatively short-term maturity.
Debt Issuance Costs	Debt Issuance Costs: Costs incurred in connection with the issuance of long-term debt are capitalized and amortized to interest expense over the term of the related debt agreement. Loan issuance costs are included in “Other assets, net” on the Company’s condensed consolidated balance sheets. As of September 30, 2018, loan issuance cost, net of amortization was $1.5 million.
Segment Reporting	Segment Reporting: The accounting guidance for disclosures about segments of an enterprise and related information requires separate financial information to be disclosed for all operating segments of a business. Accounting Standards Codification (“ASC”) 280 allows individual operating segments to be aggregated for reporting purposes if certain criteria are met. The Company determined that the Company’s two operating segments, Atlantis and Monarch Casino Black Hawk, meet all of the aggregation criteria stipulated by ASC 280-10-50-11. The Company views each property as an operating segment and the two operating segments have been aggregated into one reporting segment.
Inventories	Inventories Inventories, consisting primarily of food, beverages, and retail merchandise, are stated at the lower of cost and net realizable value. Cost is determined based on the weighted average, which approximates a first-in, first out method.
New Accounting Pronouncements	In August 2018, the FASB issued an ASU to align the requirements for capitalizing implementation costs incurred in a hosting arrangement with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The implementation costs incurred in a hosting arrangement that is a service contract should be presented as a prepaid asset in the balance sheet and expensed over the term of the hosting arrangement to the same line item in the statement of income as the costs related to the hosting fees. The guidance in this ASU is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, and early adoption is permitted including adoption in any interim period. The amendments should be applied either retrospectively or prospectively to all implementation costs incurred after adoption. The Company is currently assessing the impact the adoption of this standard will have on its Consolidated Financial Statements. In November 2016, the FASB issued amended accounting guidance on the presentation of restricted cash in the statement of cash flows. Entities are required to show the changes in the total of cash, cash equivalents, restricted cash and restricted cash equivalents in the statement of cash flows. As a result, entities no longer present transfers between cash and cash equivalents and restricted cash and restricted cash equivalents in the statement of cash flows. The amended guidance is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. We adopted this ASU on January 1, 2018, with no impact to our presentation on the Consolidated Statements of Cash Flows. In August 2016, the FASB issued an ASU that provides clarifying guidance on the presentation of certain cash receipts and cash payments in the statement of cash flows. The guidance clarifies how entities should classify certain cash receipts and cash payments on the statement of cash flows and how the predominance principle should be applied when cash receipts and cash payments have aspects of more than one class of cash flows. The ASU is effective for annual reporting periods beginning after December 15, 2017. We adopted this ASU on January 1, 2018, with no impact to our presentation of cash receipts and payments on our Consolidated Statements of Cash Flows. In February 2016, the FASB issued an ASU, amended January 2017, which addresses the recognition and measurement of leases. Under the new guidance, for all leases (with the exception of short-term leases), at the commencement date, lessees will be required to recognize a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis, and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Under the new guidance, lessor accounting is largely unchanged. Further, the new lease guidance simplifies the accounting for sale and leaseback transactions primarily because lessees must recognize lease assets and liabilities, which no longer provides a source for off- balance sheet financing. The effective date for this update is for the annual and interim periods beginning after December 15, 2018 with early adoption permitted. The standard permits two approaches, one requiring retrospective application of the new guidance with restatement of prior years, and one requiring prospective application of the new guidance. In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842) Targeted Improvements, amending certain aspects of the new leasing standard. The amendment allows an additional optional transition method whereby an entity records a cumulative effect adjustment to opening retained earnings in the year of adoption without restating prior periods. We plan to adopt the new lease standard effective January 1, 2019 and apply it prospectively. We do not expect the new lease standard to have a material effect on our results of operations or cash flows. A variety of proposed or otherwise potential accounting standards are currently under review and study by standard-setting organizations and certain regulatory agencies. Because of the tentative and preliminary nature of such proposed standards, we have not yet determined the effect, if any, the implementation of any such proposed or revised standards would have on the Company’s Consolidated Financial Statements.