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Business Operations - Assets held for sale (Details)
3 Months Ended
Jul. 26, 2019
USD ($)
a
Feb. 28, 2019
USD ($)
a
Mar. 02, 2018
USD ($)
Sep. 01, 2017
USD ($)
a
Mar. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
a
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Aug. 17, 2017
USD ($)
a
Business Operations                  
Non-refundable deposit           $ 500,000 $ 500,000    
Long term assets held for sale           21,274,000 21,282,000    
Gain (loss) on sale of land         $ 139,000        
Nashville Superspeedway | Assets held for sale                  
Business Operations                  
Acres | a   7.63              
Long term assets held for sale           $ 21,274,000 $ 21,282,000    
Proceeds, less closing costs   $ 267,000              
Gain (loss) on sale of land         139,000        
Nashville Superspeedway | Land                  
Business Operations                  
Acres | a 133     88.03   97.17     147
Purchase price (per acre)                 $ 35,000
Option purchase price (per acre)       $ 55,000   $ 66,685      
Non-refundable deposit           $ 500,000      
Period of option to execute the agreement       3 years          
Long term assets held for sale               $ 21,282,000  
Proceeds, less closing costs $ 6,397,000   $ 4,945,000            
Net proceeds after taxes 5,314,000   4,150,000            
Gain (loss) on sale of land $ 4,186,000   $ 2,512,000            
Nashville Superspeedway | Land | Minimum | Assets held for sale                  
Business Operations                  
Acres | a           1,000      
Parcel of land near St. Louis | Assets held for sale                  
Business Operations                  
Proceeds, less closing costs         $ 531,000