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Significant Accounting Policies (Disaggregation of company revenue) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation of Revenue [Line Items]    
Net operating revenue [1] $ 40,620 $ 36,398
Corporate and Other [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue [1] 860 1,192
Canada [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue 14,672 13,160
United States [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue 7,706 7,500
Poland [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue 17,382 14,546
Gaming [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue 34,007 32,487
Gaming [Member] | Corporate and Other [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue 768 717
Gaming [Member] | Canada [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue 9,747 9,020
Gaming [Member] | United States [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue 6,419 8,200
Gaming [Member] | Poland [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue 17,073 14,550
Hotel [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue 454 437
Hotel [Member] | Canada [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue 136 136
Hotel [Member] | United States [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue 318 301
Food And Beverage [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue 3,559 3,341
Food And Beverage [Member] | Canada [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue 2,490 2,347
Food And Beverage [Member] | United States [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue 885 830
Food And Beverage [Member] | Poland [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue 184 164
Other [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue 2,600 2,575
Other [Member] | Corporate and Other [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue 92 475
Other [Member] | Canada [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue 2,299 1,933
Other [Member] | United States [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue 84 77
Other [Member] | Poland [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue $ 125 90
Promotional Allowances [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue   (2,442)
Promotional Allowances [Member] | Canada [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue   (276)
Promotional Allowances [Member] | United States [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue   (1,908)
Promotional Allowances [Member] | Poland [Member]    
Disaggregation of Revenue [Line Items]    
Net operating revenue   $ (258)
[1] Net operating revenue for Corporate and Other primarily relates to the Company's cruise ship operations.