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Business Operations - Assets held for sale (Details)
Mar. 02, 2018
USD ($)
Feb. 09, 2018
USD ($)
a
Sep. 01, 2017
USD ($)
a
Dec. 31, 2018
USD ($)
a
Dec. 31, 2017
USD ($)
a
Aug. 17, 2017
USD ($)
a
Business Operations.            
Nashville Superspeedway facility       $ 23,567,000 $ 23,545,000  
Fair value of land       $ 531,000 $ 2,455,000  
Nashville Superspeedway | Land            
Business Operations.            
Acres | a   224.99 88.03     147
Option purchase price for 224.99 acres   $ 12,374,000        
Purchase price (per acre)           $ 35,000
Option purchase price (per acre)     $ 55,000      
Period of option to execute the agreement     3 years      
Proceeds, less closing costs $ 4,945,000          
Net proceeds after taxes $ 4,150,000          
Nashville Superspeedway | Land | Assets held for sale            
Business Operations.            
Acres | a         147  
Fair value of land         $ 2,455,000  
Nashville Superspeedway | Land | Minimum | Assets held for sale            
Business Operations.            
Acres | a       1,000    
Nashville Superspeedway | Additional acreage option            
Business Operations.            
Acres | a   86.45        
Option purchase price (per acre)   $ 66,685        
Period of option to execute the agreement   3 years        
Nashville Superspeedway | Additional acreage option two            
Business Operations.            
Acres | a   50.51        
Option purchase price (per acre)   $ 35,000