Description Of Business And Basis Of Presentation (Narrative) (Details) $ in Thousands, $ in Millions			1 Months Ended				3 Months Ended	6 Months Ended		12 Months Ended
	May 12, 2020 item	Aug. 05, 2019 USD ($)	Mar. 31, 2020 USD ($)	Aug. 31, 2019 CAD ($)	May 31, 2019 USD ($)	Aug. 31, 2017 USD ($) item	Jun. 30, 2020 USD ($) item	Jun. 30, 2020 USD ($) item	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Jul. 30, 2020 USD ($)	Jul. 31, 2019	Apr. 30, 2018	Oct. 31, 2014
Description Of Business And Basis Of Presentation [Line Items]
Number of ship-based casinos | item							1	1
Number of ship-based casinos closed | item	4
Number of ship-based casinos negotiating | item								3
Loss on sale of investment									$ (1)
Macquarie Capital [Member]
Description Of Business And Basis Of Presentation [Line Items]
Revolving credit facility, amount drew			$ 9,950
UniCredit Bank Austria [Member]
Description Of Business And Basis Of Presentation [Line Items]
Revolving credit facility, amount drew			7,400
Revolving Credit Facility - Financial Covenant [Member]
Description Of Business And Basis Of Presentation [Line Items]
Line of credit facility							$ 3,500	$ 3,500
Minimum [Member] | Revolving Credit Facility - Financial Covenant [Member]
Description Of Business And Basis Of Presentation [Line Items]
Line of credit facility			3,500
Lot Polish Airlines Invesment [Member] | Polish Airports Company [Member]
Description Of Business And Basis Of Presentation [Line Items]
Owned by noncontrolling interest							33.30%	33.30%
Casinos Poland [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership percentage							66.60%	66.60%
Number of casinos owned and operated | item								8
Hamilton Properties Ltd. [Member]
Description Of Business And Basis Of Presentation [Line Items]
Number of slot machines | item						200
Number of table games | item						17
Number of electronic table games | item						1
Loan for purchase of equipment						$ 5,000
Mendoza Central Entretenimientos S. A. [Member]
Description Of Business And Basis Of Presentation [Line Items]
Impairment intangible assets			1,000
Wrote-down receivable			$ 300
Century Bets [Member] | Rocky Mountain Turf Club [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership percentage				25.00%								75.00%
Purchased amount for ownership interest		$ 200		$ 0.2
Century Resorts Management GmbH [Member] | Mendoza Central Entretenimientos S. A. [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership interest							7.50%	7.50%						7.50%
Century Resorts Management GmbH [Member] | Percentage Of Century Downs Racetrack Owned By Century Casinos Europe [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership percentage							75.00%	75.00%
Golden Hospitality Ltd. [Member]
Description Of Business And Basis Of Presentation [Line Items]
Proceeds from non-interest bearing promissory note					$ 700
Loss on sale of investment										$ (100)
Golden Hospitality Ltd. [Member] | Century Resorts Management [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership percentage							51.00%	51.00%					51.00%
Century Casino Bath [Member]
Description Of Business And Basis Of Presentation [Line Items]
Gain in general and administrative expenses							$ 7,400	$ 7,400
Macquarie Capital [Member] | Subsequent Event [Member] | Revolving Credit Facility [Member]
Description Of Business And Basis Of Presentation [Line Items]
Line of credit facility											$ 0
Macquarie Capital [Member] | Subsequent Event [Member] | Line of Credit [Member]
Description Of Business And Basis Of Presentation [Line Items]
Line of credit facility											$ 50
Century Downs Racetrack And Casino [Member] | Unaffiliated Shareholders [Member]
Description Of Business And Basis Of Presentation [Line Items]
Owned by noncontrolling interest							25.00%	25.00%
Minh Chau Ltd. [Member] | Golden Hospitality Ltd. [Member] | Golden Hospitality Ltd. [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership percentage					9.21%
Minh Chau Ltd. [Member] | Golden Hospitality Ltd. [Member] | Future Invesment [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership percentage													51.00%
Minh Chau Ltd. [Member] | Golden Hospitality Ltd. [Member] | Option to Purchase [Member]
Description Of Business And Basis Of Presentation [Line Items]
Ownership percentage													70.00%
Included In Deposits And Other [Member]
Description Of Business And Basis Of Presentation [Line Items]
Restricted cash							$ 827	$ 827	$ 740
Included In Deposits And Other [Member] | Century Resorts Management GmbH [Member]
Description Of Business And Basis Of Presentation [Line Items]
Restricted cash							600	600
Deposits Related To Payments Of Prizes And Giveaways [Member] | Casinos Poland [Member]
Description Of Business And Basis Of Presentation [Line Items]
Restricted cash							200	200
Deposits Related To Insurance Policy [Member] | Maximum [Member]
Description Of Business And Basis Of Presentation [Line Items]
Restricted cash							$ 100	$ 100