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Note 2 - Acquisitions and Divestitures - Schedule of Acquired Property and Equipment of Valley Forge Convention Center Partners (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Furniture and Equipment [Member] | Minimum [Member]
Property and Equipment, Useful Life (Year)	1 year
Furniture and Equipment [Member] | Maximum [Member]
Property and Equipment, Useful Life (Year)	12 years
Valley Forge Convention Center Partners, L.P. [Member]
Property and Equipment, Recorded Amount	$ 57,118
Valley Forge Convention Center Partners, L.P. [Member] | Land [Member]
Property and Equipment, Recorded Amount	15,150
Valley Forge Convention Center Partners, L.P. [Member] | Building Improvements [Member]
Property and Equipment, Recorded Amount	$ 32,908
Valley Forge Convention Center Partners, L.P. [Member] | Building Improvements [Member] | Minimum [Member]
Property and Equipment, Useful Life (Year)	15 years
Valley Forge Convention Center Partners, L.P. [Member] | Building Improvements [Member] | Maximum [Member]
Property and Equipment, Useful Life (Year)	40 years
Valley Forge Convention Center Partners, L.P. [Member] | Furniture and Equipment [Member]
Property and Equipment, Recorded Amount	$ 9,060
Valley Forge Convention Center Partners, L.P. [Member] | Furniture and Equipment [Member] | Minimum [Member]
Property and Equipment, Useful Life (Year)	2 years
Valley Forge Convention Center Partners, L.P. [Member] | Furniture and Equipment [Member] | Maximum [Member]
Property and Equipment, Useful Life (Year)	6 years

X

- Definition

The amount of property, plant, and equipment recognized as of the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=121600890&loc=d3e2207-128464

Reference 2: 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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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- Details

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- Details

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