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Accrued Liabilities (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Accrued Liabilities    
Point loyalty program $ 1,700,000 $ 1,652,000
Payroll and related items 2,558,000 2,351,000
Win due to Delaware State Lottery Office 3,688,000 3,583,000
Other 1,865,000 2,268,000
Accrued liabilities $ 9,811,000 $ 9,854,000