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Commitments and Contingencies (Details) - USD ($)
3 Months Ended 9 Months Ended
Dec. 31, 2011
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Sep. 30, 1999
Contingent obligation              
Benefit for contingent obligation $ 2,250,000 $ (7,000) $ (128,000) $ (541,000) $ (112,000)    
Provision for contingent obligation   2,677,000   2,677,000   $ 3,218,000  
(Increase) decrease in the provision for contingent obligation due to changing interest rates   7,000 $ 128,000 541,000 $ 112,000    
Nontaxable Municipal Bonds | Indirect Guarantee of Indebtedness              
Commitments and Contingencies              
Debt issued             $ 25,900,000
Outstanding amount   11,200,000   11,200,000      
Balance available in the sales and incremental property tax fund   298,000   298,000   $ 217,000  
Amount paid into the sales and incremental property tax fund       1,369,000      
Debt service fee   1,288,000   1,288,000      
Nontaxable Municipal Bonds | Irrevocable direct-pay letter of credit              
Commitments and Contingencies              
Irrevocable direct-pay letter of credit issued   11,388,000   11,388,000      
Nontaxable Municipal Bonds | Minimum | Indirect Guarantee of Indebtedness              
Commitments and Contingencies              
Annual payment range   1,200,000   1,200,000      
Nontaxable Municipal Bonds | Maximum | Indirect Guarantee of Indebtedness              
Commitments and Contingencies              
Annual payment range   $ 1,600,000   $ 1,600,000