Note 2 - Acquisitions and Divestitures (Details Textual)					9 Months Ended	10 Months Ended	12 Months Ended
	Oct. 15, 2018 USD ($)	Sep. 17, 2018 USD ($)	Jun. 01, 2018 USD ($)	Feb. 15, 2017 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Sep. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Aug. 01, 2016
Payments to Acquire Businesses, Net of Cash Acquired, Total							$ 5,535,000		$ 934,073,000	$ 1,153,000
Goodwill, Purchase Accounting Adjustments							21,185,000			61,748,000
Borgata [Member]
Equity Method Investment, Ownership Percentage											50.00%
Refund From Tax Settlement				$ 72,000,000
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax, Total										36,200,000
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation										14,800,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Total									300,000
Pinnacle Acquisition [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total	$ 576,100,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total	$ 615,100,000						615,133,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Current Assets					$ (400,000)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment					(36,700,000)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles					39,000,000.0
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Current Liabilities					(200,000)
Goodwill, Purchase Accounting Adjustments					$ 5,800,000
Pinnacle Acquisition [Member] | Project Development, Preopening, and Writedowns Expense [Member]
Business Combination, Acquisition Related Costs							2,400,000		14,500,000	2,000,000.0
Valley Forge Convention Center Partners, L.P. [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total		$ 264,300,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total		$ 289,100,000					289,065,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Current Assets								$ (600,000)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment								600,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles								(12,000,000.0)
Goodwill, Purchase Accounting Adjustments								16,500,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Assets								2,400,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Liabilities								$ 9,200,000
Valley Forge Convention Center Partners, L.P. [Member] | Project Development, Preopening, and Writedowns Expense [Member]
Business Combination, Acquisition Related Costs							600,000		3,600,000	400,000
Lattner Entertainment Group Illinois, LLC [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total			$ 100,000,000.0
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total			$ 110,500,000				110,534,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Current Assets						$ 1,000,000.0
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment						200,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles						$ 1,200,000
Number of Gaming Units			1,000
Number of Locations			220
Lattner Entertainment Group Illinois, LLC [Member] | Project Development, Preopening, and Writedowns Expense [Member]
Business Combination, Acquisition Related Costs							$ 400,000		$ 700,000	$ 0