SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	9 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Sep. 30, 2017
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Basis of Presentation	Basis of Presentation: Monarch Casino & Resort, Inc. was incorporated in 1993 and, through its wholly owned subsidiary Golden Road Motor Inn, Inc. (“Golden Road”), owns and operates the Atlantis Casino Resort Spa, a hotel/casino facility in Reno, Nevada (the “Atlantis”). Monarch’s wholly owned subsidiaries, High Desert Sunshine, Inc. (“High Desert”), Golden East, Inc. (“Golden East”) and Golden North, Inc. (“Golden North”), each own separate parcels of land located proximate to the Atlantis. Monarch’s wholly owned subsidiary, Monarch Growth Inc. (“Monarch Growth”), formed in 2011, acquired Riviera Black Hawk, Inc., owner of the Riviera Black Hawk Casino, on April 26, 2012. Riviera Black Hawk, Inc. was renamed Monarch Black Hawk, Inc. and Riviera Black Hawk Casino was renamed Monarch Casino Black Hawk in October 2013. In addition to owning the Monarch Casino Black Hawk, Monarch Black Hawk, Inc. wholly 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. Monarch Growth’s wholly owned subsidiary, Inter-Mountain Construction, LLC, owns a parcel of land with an industrial warehouse located between Denver Colorado and Monarch Casino Black Hawk. 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. Unless otherwise indicated, “Monarch,” the “Company,” “we,” “our” and “us” refer to Monarch Casino & Resort, Inc. and its subsidiaries.
Interim Financial Statements	Interim Financial Statements: The accompanying unaudited condensed 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 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, 2017 are not necessarily indicative of the results that may be expected for the year ending December 31, 2017. The balance sheet at December 31, 2016 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, 2016.
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, 2017, loan issuance costs, net of amortization was $2.0 million.
Change in Accounting Estimate of Depreciable Life of Monarch Casino Black Hawk Parking Structure	Change in Accounting Estimate of Depreciable Life of Monarch Casino Black Hawk Parking Structure: In December 2013, the Company began construction of a new parking facility at Monarch Casino Black Hawk. Upon completion of the new structure, the Company planned to demolish the existing parking structure. At December 31, 2013, the existing parking structure had a net book value of approximately $4.8 million and a remaining depreciable life of approximately 37 years. The new parking facility was estimated to be completed on March 31, 2015. In accordance with Financial Accounting Standards Board (“FASB”) accounting standards codification (“ASC”) 250-10-45-17, effective January 1, 2014, the Company modified the estimated depreciable life of the existing parking structure to 15 months; the period from January 1, 2014 through the estimated demolition commencement date of March 31, 2015. As a result of this modification to the estimated depreciable life, depreciation expense of the existing parking structure increased by approximately $0.3 million per month (approximately $0.2 million net of tax). In July 2014, because of a delayed construction schedule, the Company revised the new parking facility completion date to December 31, 2015. At this time, the existing parking structure had a net book value of approximately $2.9 million. The Company modified the estimated depreciable life of the existing parking structure to 18 months; the period from July 1, 2014 through the revised estimated demolition commencement date of December 31, 2015. In October 2015, the general contractor notified the Company that further delay was expected and completion was then expected in the second quarter of 2016 at which time demolition of the existing structure would commence. At September 30, 2015, the existing parking structure had a net book value of approximately $0.4 million. Beginning in October 2015, the Company reduced the monthly depreciation expense to $0.04 million to reflect the revised depreciable life of the existing parking structure. The parking structure was fully depreciated as of June 30, 2016. The parking structure was demolished in the fourth quarter of 2016. For the three and nine months ended September 30, 2017, and for the three months ended September 30, 2016, the changes in estimate did not have an effect on depreciation expense, net income and diluted earnings per share. For the nine months ended September 30, 2016, the effect of the change in estimate was an increase of depreciation expense by $266 thousand, a decrease of net income by $173 thousand and a decrease of basic and diluted earnings per share by approximately $0.01.
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. 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. On January 1, 2017, we adopted the new ASU which changes the measurement principle for inventories valued under the first-in, first-out or weighted-average methods from the lower of cost or market to the lower of cost and net realizable value. Net realizable value is defined by FASB as estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. The adoption of this standard did not have a material impact on our Consolidated Financial Statements due to the nature of its inventory, consisting primarily of food, beverages, and retail merchandise.