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Note 2 - Acquisitions and Divestitures - Schedule of Acquired Intangible Assets of Valley Forge Convention Center Partners (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Valley Forge Convention Center Partners, L.P. [Member]
Intangible Assets, Recorded Amount	$ 136.6
Valley Forge Convention Center Partners, L.P. [Member] | Trademarks [Member]
Intangible Assets, Recorded Amount	12.5
Valley Forge Convention Center Partners, L.P. [Member] | Gaming License Right [Member]
Intangible Assets, Recorded Amount	$ 108.0
Customer Relationships [Member]
Intangible Assets, Useful Life (Year)	2 years 6 months	3 years 6 months
Customer Relationships [Member] | Valley Forge Convention Center Partners, L.P. [Member]
Intangible Assets, Useful Life (Year)	5 years
Intangible Assets, Recorded Amount	$ 16.1

X

- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472

+ Details

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X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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