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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Aug. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	May 21, 2020 USD ($)	Jan. 01, 2019 USD ($)	Apr. 01, 2016
Number of Reportable Segments				3
Number of Gaming Entertainment Properties		28		28
Asset Impairment Charges, Total				$ 174,700	$ 0	$ 993
Interest Costs Capitalized				100	0	0
Debt Securities, Available-for-sale, Amortized Cost, Total		$ 19,000		$ 19,000
Debt Security Interest Rate Stated Percentage		7.50%		7.50%
Debt Securities, Available-for-sale, Total		$ 16,700		$ 16,700	16,200
Debt Securities, Available-for-sale, Current, Total		600		600	600
Debt Securities, Available-for-sale, Noncurrent		16,100		16,100	15,600
Taxes, Other				388,000	546,700	367,500
Advertising Expense				$ 20,200	$ 44,700	$ 33,700
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | shares				0	0	0
Nonrecurring Gain Related to Property Closures				$ 40,000
Operating Lease, Right-of-Use Asset		$ 928,814		$ 928,814	$ 936,170
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset								$ 935,100
Operating Lease, Liability, Total								921,800
Accrued Rent, Current								$ 13,300
Borgata [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners									50.00%
Senior Notes [Member] | Senior Note 8.625% Due 2025 [Member]
Debt Instrument, Face Amount							$ 600,000
Debt Instrument, Interest Rate, Stated Percentage		8.625%		8.625%			8.625%
Line of Credit [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Increase in Available Borrowing Capacity	$ 88,200
COVID 19 [Member]
Number of Gaming Entertainment Properties, Open and Operating		24		24
Asset Impairment Charges, Total		$ 3,600	$ 171,100

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