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Nature of Business and Basis of Presentation (Details Textual)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 01, 2018
Jan. 31, 2018
USD ($)
shares
Jun. 30, 2018
USD ($)
Property
$ / shares
Mar. 31, 2018
Jun. 30, 2018
USD ($)
Segment
Property
Jun. 30, 2017
USD ($)
Nature Of Business And Basis Of Presentation [Line Items]            
Number of reportable operating segments | Segment         2  
Proceeds from issuance of common stock         $ 25,969 $ 153
Decrease in depreciation expense     $ (2,100)      
Increase in net income     $ 1,700      
Increase in earnings per share basic | $ / shares     $ 0.07      
Increase in earnings per share diluted | $ / shares     $ 0.06      
Building and Building Improvements [Member]            
Nature Of Business And Basis Of Presentation [Line Items]            
Estimated useful lives 19 years     10 years    
Initial Public Offering [Member]            
Nature Of Business And Basis Of Presentation [Line Items]            
Common stock shares resold by shareholders | shares   6,500,000        
Newly issued shares of common stock | shares   975,000        
Proceeds from issuance of common stock   $ 25,600        
Nevada and Maryland [Member]            
Nature Of Business And Basis Of Presentation [Line Items]            
Number of resort casino properties | Property     8   8