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Related Party Transactions (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
mi
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dover Downs Gaming & Entertainment, Inc.        
Related Party Transactions        
Payable to related party $ 471,000 $ 430,000 $ 885,000  
Receivable from related party 34,000 $ 110,000 140,000  
Current payable due to related party       $ 9,000
Harness racing track length (in miles) | mi   0.625    
Motorsports superspeedway length (in miles) | mi   1    
Period for set up and tear down rights   14 days    
Dover Downs Gaming & Entertainment, Inc. | NASCAR        
Related Party Transactions        
Payable to related party 391,000   391,000  
Receivable from related party $ 115,000 $ 15,000 $ 115,000  
Chairman of the Board        
Related Party Transactions        
Voting rights (in percent)   50.00%