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Business Operations - Assets held for sale (Details)
1 Months Ended 3 Months Ended 12 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 ($)
a
Nov. 30, 2020
USD ($)
a
Sep. 30, 2018
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
a
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 25, 2019
USD ($)
Aug. 17, 2017
USD ($)
a
Business Operations                          
Non-refundable deposit                   $ 500,000      
Gain (loss) on sale of land                 $ 4,843,000 $ 4,325,000 $ 2,413,000    
Nashville Superspeedway | Assets held for sale                          
Business Operations                          
Acres | a     7.63     350     650        
Non-refundable deposit           $ 500,000              
Proceeds, less closing costs     $ 267,000     $ 14,355,000              
Gain (loss) on sale of land               $ 139,000          
Nashville Superspeedway | Land [Member]                          
Business Operations                          
Acres | a 97 133     88               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          
Gain (loss) on sale of land             $ (99,000)