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Commitments and Contingencies (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2011
Sep. 30, 1999
Commitments and Contingencies          
Equipment rental expense $ 81,000 $ 47,000 $ 67,000    
Contingent obligation          
(Benefit) provision for contingent obligation (171,000) 1,005,000 $ 424,000 $ 2,250,000  
Provision for contingent obligation $ 3,218,000 3,389,000      
Tax gross up for parachute payment          
Commitments and Contingencies          
Percentage of monthly amount paid in consideration of non-compete covenants 50.00%        
Minimum [Member] | Employment, severance and noncompete          
Commitments and Contingencies          
Maximum contingent liability $ 8,000,000        
Minimum [Member] | Tax gross up for parachute payment          
Commitments and Contingencies          
Maximum contingent liability 2,000,000        
Maximum [Member] | Employment, severance and noncompete          
Commitments and Contingencies          
Maximum contingent liability 8,900,000        
Maximum [Member] | Tax gross up for parachute payment          
Commitments and Contingencies          
Maximum contingent liability 2,900,000        
Nontaxable Municipal Bonds [Member] | Indirect Guarantee of Indebtedness [Member]          
Commitments and Contingencies          
Outstanding amount 12,300,000        
Balance available in the sales and incremental property tax fund 217,000 $ 637,000      
Amount paid into the sales and incremental property tax fund 945,000        
Debt service fee 1,365,000        
Nontaxable Municipal Bonds [Member] | Irrevocable direct-pay letter of credit          
Commitments and Contingencies          
Irrevocable direct-pay letter of credit issued 12,506,000        
Nontaxable Municipal Bonds [Member] | Minimum [Member] | Indirect Guarantee of Indebtedness [Member]          
Commitments and Contingencies          
Annual payment range 1,100,000        
Nontaxable Municipal Bonds [Member] | Maximum [Member] | Indirect Guarantee of Indebtedness [Member]          
Commitments and Contingencies          
Annual payment range $ 1,600,000        
Nontaxable Municipal Bonds [Member] | Sports Authority of the County of Wilson (Tennessee) | Indirect Guarantee of Indebtedness [Member]          
Commitments and Contingencies          
Debt issued         $ 25,900,000