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Business Operations - Assets held for sale (Details)
3 Months Ended 9 Months Ended
Jul. 29, 2020
USD ($)
a
Jul. 26, 2019
USD ($)
a
Feb. 28, 2019
USD ($)
a
Mar. 02, 2018
USD ($)
Sep. 01, 2017
USD ($)
a
Sep. 30, 2020
USD ($)
a
Sep. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2020
USD ($)
a
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Aug. 17, 2017
USD ($)
a
Business Operations                        
Non-refundable deposit                     $ 500,000  
Gain (loss) on sale of land           $ 4,843,000 $ 4,186,000   $ 4,843,000 $ 4,325,000    
Nashville Superspeedway | Assets held for sale                        
Business Operations                        
Acres | a     7.63                  
Proceeds, less closing costs     $ 267,000                  
Gain (loss) on sale of land               $ 139,000        
Nashville Superspeedway | Land                        
Business Operations                        
Acres | a 97 133     88.03 1,000     1,000     147
Purchase price (per acre)                       $ 35,000
Option purchase price (per acre)         $ 55,000              
Non-refundable deposit $ 500,000                      
Period of option to execute the agreement         3 years              
Proceeds, less closing costs 6,460,000 $ 6,397,000   $ 4,945,000                
Net proceeds after taxes 5,290,000 5,314,000   4,150,000                
Gain (loss) on sale of land $ 4,843,000 $ 4,186,000   $ 2,512,000                
Parcel of land near St. Louis | Assets held for sale                        
Business Operations                        
Proceeds, less closing costs               $ 531,000